diff --git a/src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.cpp b/src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.cpp
index fc579ff84..07e43d179 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.cpp
@@ -845,6 +845,13 @@ void GLGizmoMmuSegmentation::on_render_input_window(float x, float y, float bott
     ImGui::SameLine();
 
     if (m_current_tool == ImGui::GapFillIcon) {
+        m_imgui->disabled_begin(!(TriangleSelectorPatch::exist_gap_area));
+        ImGui::PushStyleColor(ImGuiCol_Button, m_is_dark_mode ? ImVec4(0 / 255.0, 174 / 255.0, 66 / 255.0, 1.0) : ImVec4(0 / 255.0, 174 / 255.0, 66 / 255.0, 1.0));
+        ImGui::PushStyleColor(ImGuiCol_ButtonHovered,
+                              m_is_dark_mode ? ImVec4(50 / 255.0f, 238 / 255.0f, 61 / 255.0f, 1.00f) : ImVec4(50 / 255.0f, 238 / 255.0f, 61 / 255.0f, 1.00f));
+        ImGui::PushStyleColor(ImGuiCol_ButtonActive,
+                              m_is_dark_mode ? ImVec4(206 / 255.0f, 206 / 255.0f, 206 / 255.0f, 1.00f) : ImVec4(206 / 255.0f, 206 / 255.0f, 206 / 255.0f, 1.00f));
+        ImGui::PushStyleColor(ImGuiCol_Text, m_is_dark_mode ? ImVec4(255 / 255.0f, 255 / 255.0f, 255 / 255.0f, 1.00f) : ImVec4(255 / 255.0f, 255 / 255.0f, 255 / 255.0f, 1.00f));
         if (m_imgui->button(m_desc.at("perform"))) {
             Plater::TakeSnapshot snapshot(wxGetApp().plater(), "Gap fill", UndoRedo::SnapshotType::GizmoAction);
 
@@ -856,7 +863,8 @@ void GLGizmoMmuSegmentation::on_render_input_window(float x, float y, float bott
             update_model_object();
             m_parent.set_as_dirty();
         }
-
+        ImGui::PopStyleColor(4);
+        m_imgui->disabled_end();
         ImGui::SameLine();
     }
 
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp b/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp
index 87c238118..c5e504cdc 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp
@@ -1328,6 +1328,7 @@ bool TrianglePatch::is_fragment() const
 }
 
 float TriangleSelectorPatch::gap_area = TriangleSelectorPatch::GapAreaMin;
+bool  TriangleSelectorPatch::exist_gap_area = false;
 
 void TriangleSelectorPatch::render(ImGuiWrapper* imgui)
 {
@@ -1359,7 +1360,7 @@ void TriangleSelectorPatch::render(ImGuiWrapper* imgui)
             shader->set_uniform("show_wireframe", false);
         }
     }
-
+    TriangleSelectorPatch::exist_gap_area = false;
     for (size_t buffer_idx = 0; buffer_idx < m_triangle_patches.size(); ++buffer_idx) {
         if (this->has_VBOs(buffer_idx)) {
             const TrianglePatch& patch = m_triangle_patches[buffer_idx];
@@ -1368,6 +1369,7 @@ void TriangleSelectorPatch::render(ImGuiWrapper* imgui)
                 size_t color_idx = (size_t)*patch.neighbor_types.begin();
                 color = m_ebt_colors[color_idx];
                 color[3] = 0.85;
+                TriangleSelectorPatch::exist_gap_area = true;
             }
             else {
                 size_t color_idx = (size_t)patch.type;
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp b/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp
index f5ad08a6c..f72a51db3 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp
@@ -150,6 +150,7 @@ public:
 
     // BBS: fix me
     static float gap_area;
+    static bool exist_gap_area;
 
 protected:
     // Release the geometry data, release OpenGL VBOs.