diff --git a/src/BambuStudio.cpp b/src/BambuStudio.cpp
index ba8baff12..a58c3d3c9 100644
--- a/src/BambuStudio.cpp
+++ b/src/BambuStudio.cpp
@@ -1735,6 +1735,7 @@ int CLI::run(int argc, char **argv)
 
     // loop through action options
     bool export_to_3mf = false, load_slicedata = false, export_slicedata = false, export_slicedata_error = false;
+    bool no_check = false;
     std::string export_3mf_file, load_slice_data_dir, export_slice_data_dir;
     std::string outfile_dir = m_config.opt_string("outputdir");
     std::vector<ThumbnailData*> calibration_thumbnails;
@@ -1791,6 +1792,8 @@ int CLI::run(int argc, char **argv)
         } */else if (opt_key == "export_3mf") {
             export_to_3mf = true;
             export_3mf_file = m_config.opt_string(opt_key);
+        }else if(opt_key=="no_check"){
+            no_check = true;
         //} else if (opt_key == "export_gcode" || opt_key == "export_sla" || opt_key == "slice") {
         } else if (opt_key == "export_slicedata") {
             export_slicedata = true;
@@ -1955,6 +1958,7 @@ int CLI::run(int argc, char **argv)
                         new_print_config.apply(*part_plate->config());
                         new_print_config.apply(m_extra_config, true);
                         print->apply(model, new_print_config);
+                        print->set_no_check_flag(no_check);//BBS
                         StringObjectException warning;
                         auto err = print->validate(&warning);
                         if (!err.string.empty()) {
diff --git a/src/libslic3r/CMakeLists.txt b/src/libslic3r/CMakeLists.txt
index 0e5fd059a..2f3b9b90e 100644
--- a/src/libslic3r/CMakeLists.txt
+++ b/src/libslic3r/CMakeLists.txt
@@ -139,6 +139,8 @@ set(lisbslic3r_sources
     GCode/GCodeProcessor.hpp
     GCode/AvoidCrossingPerimeters.cpp
     GCode/AvoidCrossingPerimeters.hpp
+    GCode/ConflictChecker.cpp
+    GCode/ConflictChecker.hpp
     GCode.cpp
     GCode.hpp
     GCodeReader.cpp
diff --git a/src/libslic3r/GCode/ConflictChecker.cpp b/src/libslic3r/GCode/ConflictChecker.cpp
new file mode 100644
index 000000000..3cf1aa49a
--- /dev/null
+++ b/src/libslic3r/GCode/ConflictChecker.cpp
@@ -0,0 +1,252 @@
+#include "ConflictChecker.hpp"
+
+#include <tbb/parallel_for.h>
+#include <tbb/concurrent_vector.h>
+
+#include <map>
+#include <functional>
+#include <atomic>
+
+namespace Slic3r {
+
+namespace RasterizationImpl {
+using IndexPair = std::pair<int64_t, int64_t>;
+using Grids     = std::vector<IndexPair>;
+
+inline constexpr int64_t RasteXDistance = scale_(1);
+inline constexpr int64_t RasteYDistance = scale_(1);
+
+inline IndexPair point_map_grid_index(const Point &pt, int64_t xdist, int64_t ydist)
+{
+    auto x = pt.x() / xdist;
+    auto y = pt.y() / ydist;
+    return std::make_pair(x, y);
+}
+
+inline bool nearly_equal(const Point &p1, const Point &p2) { return std::abs(p1.x() - p2.x()) < SCALED_EPSILON && std::abs(p1.y() - p2.y()) < SCALED_EPSILON; }
+
+inline Grids line_rasterization(const Line &line, int64_t xdist = RasteXDistance, int64_t ydist = RasteYDistance)
+{
+    Grids     res;
+    Point     rayStart     = line.a;
+    Point     rayEnd       = line.b;
+    IndexPair currentVoxel = point_map_grid_index(rayStart, xdist, ydist);
+    IndexPair firstVoxel   = currentVoxel;
+    IndexPair lastVoxel    = point_map_grid_index(rayEnd, xdist, ydist);
+
+    Point ray = rayEnd - rayStart;
+
+    double stepX = ray.x() >= 0 ? 1 : -1;
+    double stepY = ray.y() >= 0 ? 1 : -1;
+
+    double nextVoxelBoundaryX = (currentVoxel.first + stepX) * xdist;
+    double nextVoxelBoundaryY = (currentVoxel.second + stepY) * ydist;
+
+    if (stepX < 0) { nextVoxelBoundaryX += xdist; }
+    if (stepY < 0) { nextVoxelBoundaryY += ydist; }
+
+    double tMaxX = ray.x() != 0 ? (nextVoxelBoundaryX - rayStart.x()) / ray.x() : DBL_MAX;
+    double tMaxY = ray.y() != 0 ? (nextVoxelBoundaryY - rayStart.y()) / ray.y() : DBL_MAX;
+
+    double tDeltaX = ray.x() != 0 ? static_cast<double>(xdist) / ray.x() * stepX : DBL_MAX;
+    double tDeltaY = ray.y() != 0 ? static_cast<double>(ydist) / ray.y() * stepY : DBL_MAX;
+
+    res.push_back(currentVoxel);
+
+    double tx = tMaxX;
+    double ty = tMaxY;
+
+    while (lastVoxel != currentVoxel) {
+        if (lastVoxel.first == currentVoxel.first) {
+            for (int64_t i = currentVoxel.second; i != lastVoxel.second; i += (int64_t) stepY) {
+                currentVoxel.second += (int64_t) stepY;
+                res.push_back(currentVoxel);
+            }
+            break;
+        }
+        if (lastVoxel.second == currentVoxel.second) {
+            for (int64_t i = currentVoxel.first; i != lastVoxel.first; i += (int64_t) stepX) {
+                currentVoxel.first += (int64_t) stepX;
+                res.push_back(currentVoxel);
+            }
+            break;
+        }
+
+        if (tx < ty) {
+            currentVoxel.first += (int64_t) stepX;
+            tx += tDeltaX;
+        } else {
+            currentVoxel.second += (int64_t) stepY;
+            ty += tDeltaY;
+        }
+        res.push_back(currentVoxel);
+        if (res.size() >= 100000) { // bug
+            assert(0);
+        }
+    }
+
+    return res;
+}
+} // namespace RasterizationImpl
+
+void LinesBucketQueue::emplace_back_bucket(std::vector<ExtrusionPaths> &&paths, PrintObject *objPtr, Point offset)
+{
+    auto oldSize = _buckets.capacity();
+    _buckets.emplace_back(std::move(paths), objPtr, offset);
+    _pq.push(&_buckets.back());
+    auto newSize = _buckets.capacity();
+    if (oldSize != newSize) { // pointers change
+        decltype(_pq) newQueue;
+        for (LinesBucket &bucket : _buckets) { newQueue.push(&bucket); }
+        std::swap(_pq, newQueue);
+    }
+}
+
+void LinesBucketQueue::removeLowests()
+{
+    auto lowest = _pq.top();
+    _pq.pop();
+
+    std::vector<LinesBucket *> lowests;
+    lowests.push_back(lowest);
+
+    while (_pq.empty() == false && std::abs(_pq.top()->curHeight() - lowest->curHeight()) < EPSILON) {
+        lowests.push_back(_pq.top());
+        _pq.pop();
+    }
+
+    for (LinesBucket *bp : lowests) {
+        bp->raise();
+        if (bp->valid()) { _pq.push(bp); }
+    }
+}
+
+LineWithIDs LinesBucketQueue::getCurLines() const
+{
+    LineWithIDs lines;
+    for (const LinesBucket &bucket : _buckets) {
+        if (bucket.valid()) {
+            LineWithIDs tmpLines = bucket.curLines();
+            lines.insert(lines.end(), tmpLines.begin(), tmpLines.end());
+        }
+    }
+    return lines;
+}
+
+void getExtrusionPathsFromEntity(const ExtrusionEntityCollection *entity, ExtrusionPaths &paths)
+{
+    std::function<void(const ExtrusionEntityCollection *, ExtrusionPaths &)> getExtrusionPathImpl = [&](const ExtrusionEntityCollection *entity, ExtrusionPaths &paths) {
+        for (auto entityPtr : entity->entities) {
+            if (const ExtrusionEntityCollection *collection = dynamic_cast<ExtrusionEntityCollection *>(entityPtr)) {
+                getExtrusionPathImpl(collection, paths);
+            } else if (const ExtrusionPath *path = dynamic_cast<ExtrusionPath *>(entityPtr)) {
+                paths.push_back(*path);
+            } else if (const ExtrusionMultiPath *multipath = dynamic_cast<ExtrusionMultiPath *>(entityPtr)) {
+                for (const ExtrusionPath &path : multipath->paths) { paths.push_back(path); }
+            } else if (const ExtrusionLoop *loop = dynamic_cast<ExtrusionLoop *>(entityPtr)) {
+                for (const ExtrusionPath &path : loop->paths) { paths.push_back(path); }
+            }
+        }
+    };
+    getExtrusionPathImpl(entity, paths);
+}
+
+ExtrusionPaths getExtrusionPathsFromLayer(LayerRegionPtrs layerRegionPtrs)
+{
+    ExtrusionPaths paths;
+    for (auto regionPtr : layerRegionPtrs) {
+        getExtrusionPathsFromEntity(&regionPtr->perimeters, paths);
+        if (regionPtr->perimeters.empty() == false) { getExtrusionPathsFromEntity(&regionPtr->fills, paths); }
+    }
+    return paths;
+}
+
+ExtrusionPaths getExtrusionPathsFromSupportLayer(SupportLayer *supportLayer)
+{
+    ExtrusionPaths paths;
+    getExtrusionPathsFromEntity(&supportLayer->support_fills, paths);
+    return paths;
+}
+
+std::pair<std::vector<ExtrusionPaths>, std::vector<ExtrusionPaths>> getAllLayersExtrusionPathsFromObject(PrintObject *obj)
+{
+    std::vector<ExtrusionPaths> objPaths, supportPaths;
+
+    for (auto layerPtr : obj->layers()) { objPaths.push_back(getExtrusionPathsFromLayer(layerPtr->regions())); }
+
+    for (auto supportLayerPtr : obj->support_layers()) { supportPaths.push_back(getExtrusionPathsFromSupportLayer(supportLayerPtr)); }
+
+    return {std::move(objPaths), std::move(supportPaths)};
+}
+
+ConflictRet ConflictChecker::find_inter_of_lines(const LineWithIDs &lines)
+{
+    using namespace RasterizationImpl;
+    std::map<IndexPair, std::vector<int>> indexToLine;
+
+    for (int i = 0; i < lines.size(); ++i) {
+        const LineWithID &l1      = lines[i];
+        auto              indexes = line_rasterization(l1._line);
+        for (auto index : indexes) {
+            const auto &possibleIntersectIdxs = indexToLine[index];
+            for (auto possibleIntersectIdx : possibleIntersectIdxs) {
+                const LineWithID &l2 = lines[possibleIntersectIdx];
+                if (auto interRes = line_intersect(l1, l2); interRes.has_value()) { return interRes; }
+            }
+            indexToLine[index].push_back(i);
+        }
+    }
+    return {};
+}
+
+ConflictRet ConflictChecker::find_inter_of_lines_in_diff_objs(PrintObjectPtrs objs) // find the first intersection point of lines in different objects
+{
+    LinesBucketQueue conflictQueue;
+    for (PrintObject *obj : objs) {
+        auto layers = getAllLayersExtrusionPathsFromObject(obj);
+        conflictQueue.emplace_back_bucket(std::move(layers.first), obj, obj->instances().front().shift);
+        conflictQueue.emplace_back_bucket(std::move(layers.second), obj, obj->instances().front().shift);
+    }
+
+    std::vector<LineWithIDs> layersLines;
+    while (conflictQueue.valid()) {
+        LineWithIDs lines = conflictQueue.getCurLines();
+        conflictQueue.removeLowests();
+        layersLines.push_back(std::move(lines));
+    }
+
+    bool                                   find = false;
+    tbb::concurrent_vector<ConflictResult> conflict;
+
+    tbb::parallel_for(tbb::blocked_range<size_t>( 0, layersLines.size()), [&](tbb::blocked_range<size_t> range) {
+        for (size_t i = range.begin(); i < range.end(); i++) {
+            auto interRes = find_inter_of_lines(layersLines[i]);
+            if (interRes.has_value()) {
+                find = true;
+                conflict.emplace_back(interRes.value());
+                break;
+            }
+        }
+    });
+
+    if (find) {
+        return {conflict[0]};
+    } else
+        return {};
+}
+
+ConflictRet ConflictChecker::line_intersect(const LineWithID &l1, const LineWithID &l2)
+{
+    if (l1._objPtr == l2._objPtr) { return {}; } // return true if lines are from same object
+    Point inter;
+    bool  intersect = l1._line.intersection(l2._line, &inter);
+    if (intersect) {
+        auto dist1 = std::min(unscale(Point(l1._line.a - inter)).norm(), unscale(Point(l1._line.b - inter)).norm());
+        auto dist2 = std::min(unscale(Point(l2._line.a - inter)).norm(), unscale(Point(l2._line.b - inter)).norm());
+        auto dist  = std::min(dist1, dist2);
+        if (dist > 0.01) { return std::make_optional<ConflictResult>(l1._objPtr, l2._objPtr); } // the two lines intersects if dist>0.01mm
+    }
+    return {};
+}
+
+} // namespace Slic3r
\ No newline at end of file
diff --git a/src/libslic3r/GCode/ConflictChecker.hpp b/src/libslic3r/GCode/ConflictChecker.hpp
new file mode 100644
index 000000000..0a0242e30
--- /dev/null
+++ b/src/libslic3r/GCode/ConflictChecker.hpp
@@ -0,0 +1,116 @@
+#ifndef slic3r_ConflictChecker_hpp_
+#define slic3r_ConflictChecker_hpp_
+
+#include "../Utils.hpp"
+#include "../Model.hpp"
+#include "../Print.hpp"
+#include "../Layer.hpp"
+
+#include <queue>
+#include <vector>
+#include <optional>
+
+namespace Slic3r {
+
+struct LineWithID
+{
+    Line         _line;
+    PrintObject *_objPtr;
+    int          _role;
+
+    LineWithID(const Line &line, PrintObject *objPtr, int role) : _line(line), _objPtr(objPtr), _role(role) {}
+};
+
+using LineWithIDs = std::vector<LineWithID>;
+
+class LinesBucket
+{
+private:
+    double   _curHeight  = 0.0;
+    unsigned _curPileIdx = 0;
+
+    std::vector<ExtrusionPaths> _piles;
+    PrintObject *               _objPtr;
+    Point                       _offset;
+
+public:
+    LinesBucket(std::vector<ExtrusionPaths> &&paths, PrintObject *objPtr, Point offset) : _piles(paths), _objPtr(objPtr), _offset(offset) {}
+    LinesBucket(LinesBucket &&) = default;
+
+    bool valid() const { return _curPileIdx < _piles.size(); }
+    void raise()
+    {
+        if (valid()) {
+            if (_piles[_curPileIdx].empty() == false) { _curHeight += _piles[_curPileIdx].front().height; }
+            _curPileIdx++;
+        }
+    }
+    double      curHeight() const { return _curHeight; }
+    LineWithIDs curLines() const
+    {
+        LineWithIDs lines;
+        for (const ExtrusionPath &path : _piles[_curPileIdx]) {
+            if (path.is_force_no_extrusion() == false) {
+                Polyline check_polyline = path.polyline;
+                if (path.role() != ExtrusionRole::erBrim) { check_polyline.translate(_offset); }
+                Lines tmpLines = check_polyline.lines();
+                for (const Line &line : tmpLines) { lines.emplace_back(line, _objPtr, path.role()); }
+            }
+        }
+        return lines;
+    }
+
+    friend bool operator>(const LinesBucket &left, const LinesBucket &right) { return left._curHeight > right._curHeight; }
+    friend bool operator<(const LinesBucket &left, const LinesBucket &right) { return left._curHeight < right._curHeight; }
+    friend bool operator==(const LinesBucket &left, const LinesBucket &right) { return left._curHeight == right._curHeight; }
+};
+
+struct LinesBucketPtrComp
+{
+    bool operator()(const LinesBucket *left, const LinesBucket *right) { return *left > *right; }
+};
+
+class LinesBucketQueue
+{
+private:
+    std::vector<LinesBucket>                                                           _buckets;
+    std::priority_queue<LinesBucket *, std::vector<LinesBucket *>, LinesBucketPtrComp> _pq;
+
+public:
+    void emplace_back_bucket(std::vector<ExtrusionPaths> &&paths, PrintObject *objPtr, Point offset);
+    bool valid() const { return _pq.empty() == false; }
+
+    void        removeLowests();
+    LineWithIDs getCurLines() const;
+};
+
+void getExtrusionPathsFromEntity(const ExtrusionEntityCollection *entity, ExtrusionPaths &paths);
+
+ExtrusionPaths getExtrusionPathsFromLayer(LayerRegionPtrs layerRegionPtrs);
+
+ExtrusionPaths getExtrusionPathsFromSupportLayer(SupportLayer *supportLayer);
+
+std::pair<std::vector<ExtrusionPaths>, std::vector<ExtrusionPaths>> getAllLayersExtrusionPathsFromObject(PrintObject *obj);
+
+struct ConflictResult
+{
+    PrintObject *_obj1;
+    PrintObject *_obj2;
+    ConflictResult(PrintObject *obj1, PrintObject *obj2) : _obj1(obj1), _obj2(obj2) {}
+    ConflictResult() = default;
+};
+
+static_assert(std::is_trivial<ConflictResult>::value, "atomic value requires to be trival.");
+
+using ConflictRet = std::optional<ConflictResult>;
+
+struct ConflictChecker
+{
+    static ConflictRet find_inter_of_lines_in_diff_objs(PrintObjectPtrs objs);
+    static ConflictRet find_inter_of_lines(const LineWithIDs &lines);
+    static ConflictRet line_intersect(const LineWithID &l1, const LineWithID &l2);
+};
+
+} // namespace Slic3r
+
+#endif
diff --git a/src/libslic3r/Print.cpp b/src/libslic3r/Print.cpp
index cb72ac229..5af302ead 100644
--- a/src/libslic3r/Print.cpp
+++ b/src/libslic3r/Print.cpp
@@ -27,6 +27,10 @@
 //BBS: add json support
 #include "nlohmann/json.hpp"
 
+#include "GCode/ConflictChecker.hpp"
+
+#include <codecvt>
+
 using namespace nlohmann;
 
 // Mark string for localization and translate.
@@ -1661,6 +1665,25 @@ void Print::process(bool use_cache)
         }
     }
 
+    // BBS
+    if(!m_no_check)
+    {
+        this->set_started(psConflictCheck);
+        this->set_status(70, L("Checking gcode path conflicts."));
+        using Clock                 = std::chrono::high_resolution_clock;
+        auto            startTime   = Clock::now();
+        auto            conflictRes = ConflictChecker::find_inter_of_lines_in_diff_objs(m_objects);
+        auto            endTime     = Clock::now();
+        volatile double seconds     = std::chrono::duration_cast<std::chrono::milliseconds>(endTime - startTime).count() / (double) 1000;
+        if (conflictRes.has_value()) {
+            auto         objName1 = conflictRes.value()._obj1->m_model_object->name;
+            auto         objName2 = conflictRes.value()._obj2->m_model_object->name;
+            //throw Slic3r::SlicingError((boost::format(L("Conflicts of gcode paths have been found. Please separate the conflicted objects (%s + %s) farther.")) % objName1% objName2).str());
+            this->active_step_add_warning(PrintStateBase::WarningLevel::CRITICAL, (boost::format(L("Conflicts of gcode paths have been found. Please separate the conflicted objects (%s <-> %s) farther.")) % objName1 % objName2).str());
+        }
+         this->set_done(psConflictCheck);
+    }
+
     BOOST_LOG_TRIVIAL(info) << "Slicing process finished." << log_memory_info();
 }
 
diff --git a/src/libslic3r/Print.hpp b/src/libslic3r/Print.hpp
index 27dcfc32f..450916271 100644
--- a/src/libslic3r/Print.hpp
+++ b/src/libslic3r/Print.hpp
@@ -79,7 +79,8 @@ enum PrintStep {
     // should be refreshed.
     psSlicingFinished = psSkirtBrim,
     psGCodeExport,
-    psCount,
+    psConflictCheck,
+    psCount
 };
 
 enum PrintObjectStep {
diff --git a/src/libslic3r/PrintBase.hpp b/src/libslic3r/PrintBase.hpp
index 0d8730b07..60087a396 100644
--- a/src/libslic3r/PrintBase.hpp
+++ b/src/libslic3r/PrintBase.hpp
@@ -510,6 +510,8 @@ public:
     //BBS: get/set plate id
     int get_plate_index() const { return m_plate_index; }
     void set_plate_index(int index) { m_plate_index = index; }
+    bool get_no_check_flag() const { return m_no_check; }
+    void set_no_check_flag(bool no_check) { m_no_check = no_check; }
 
 protected:
 	friend class PrintObjectBase;
@@ -544,6 +546,7 @@ protected:
 
     //BBS: add plate id into print base
     int m_plate_index{ 0 };
+    bool m_no_check = false;
 
     // Callback to be evoked regularly to update state of the UI thread.
     status_callback_type                    m_status_callback;
diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index e265fc903..2d6d39e6c 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -4608,6 +4608,14 @@ CLIActionsConfigDef::CLIActionsConfigDef()
     def->cli_params = "time";
     def->set_default_value(new ConfigOptionInt(300));
 
+    // must define new params here, otherwise comamnd param check will fail
+    def = this->add("no_check", coBool);
+    def->label = L("No check");
+    def->tooltip = L("Do not run any validity checks, such as gcode path conflicts check.");
+    def->cli = "no_check";
+    def->cli_params = "option";
+    def->set_default_value(new ConfigOptionBool(false));
+
     /*def = this->add("help_fff", coBool);
     def->label = L("Help (FFF options)");
     def->tooltip = L("Show the full list of print/G-code configuration options.");