diff --git a/ArchitectureColoredPainting/src/Editor/LayerStyle.cpp b/ArchitectureColoredPainting/src/Editor/LayerStyle.cpp
index c57ea2f..7240d46 100644
--- a/ArchitectureColoredPainting/src/Editor/LayerStyle.cpp
+++ b/ArchitectureColoredPainting/src/Editor/LayerStyle.cpp
@@ -254,7 +254,7 @@ StrokeElementLayerStyle::StrokeElementLayerStyle()
     
 }
 
-StrokeElementLayerStyle::StrokeElementLayerStyle(PMaterialStyleStroke left, PMaterialStyleStroke right)
+StrokeElementLayerStyle::StrokeElementLayerStyle(const PMaterialStyleStroke& left, const PMaterialStyleStroke& right)
 {
     this->strokePair.first = left;
     this->strokePair.second = right ? right : std::static_pointer_cast<MaterialStyleStroke>(
@@ -318,7 +318,7 @@ QWidget* FillElementLayerStyle::getListDisplayWidget() const
     return w;
 }
 
-FillElementLayerStyle::FillElementLayerStyle(const PMaterialStyleFill fillMaterialStyle)
+FillElementLayerStyle::FillElementLayerStyle(const PMaterialStyleFill& fillMaterialStyle)
 	: fillMaterialStyle(fillMaterialStyle)
 {
 	if (!fillMaterialStyle)
diff --git a/ArchitectureColoredPainting/src/Editor/LayerStyle.h b/ArchitectureColoredPainting/src/Editor/LayerStyle.h
index 6db22d6..3d9b023 100644
--- a/ArchitectureColoredPainting/src/Editor/LayerStyle.h
+++ b/ArchitectureColoredPainting/src/Editor/LayerStyle.h
@@ -83,7 +83,7 @@ public:
 	static std::unique_ptr<StrokeElementLayerStyle> fromJson(const QJsonObject& json);
 
     StrokeElementLayerStyle();
-    StrokeElementLayerStyle(PMaterialStyleStroke left, PMaterialStyleStroke right = nullptr);
+    StrokeElementLayerStyle(const PMaterialStyleStroke& left, const PMaterialStyleStroke& right = nullptr);
     StrokeElementLayerStyle(const StrokeElementLayerStyle& other);
     ~StrokeElementLayerStyle() override = default;
 
@@ -105,7 +105,7 @@ public:
     STYLE_NAME("Ìî³ä", "fill")
 	static std::unique_ptr<FillElementLayerStyle> fromJson(const QJsonObject& json);
 
-    FillElementLayerStyle(PMaterialStyleFill fillMaterialStyle = nullptr);
+    FillElementLayerStyle(const PMaterialStyleFill& fillMaterialStyle = nullptr);
     FillElementLayerStyle(const FillElementLayerStyle& other);
     ~FillElementLayerStyle() override = default;