diff --git a/ArchitectureColoredPainting/src/Renderer/Painting/ShortCutTree.cpp b/ArchitectureColoredPainting/src/Renderer/Painting/ShortCutTree.cpp
index 7308c33..df50a92 100644
--- a/ArchitectureColoredPainting/src/Renderer/Painting/ShortCutTree.cpp
+++ b/ArchitectureColoredPainting/src/Renderer/Painting/ShortCutTree.cpp
@@ -112,10 +112,8 @@ void ShortCutTree::generateShortCutSegment(ShortCutNode& nowTreeNode) {
 	}
 	for (auto& iter : pointSet) {
 		nowTreeNode.lineSet.push_back(numLine);
-		lineIndexs.push_back(iter.first);
-		lineIndexs.push_back(iter.first);
-		lineIndexs.push_back(iter.second);
-		lineIndexs.push_back(iter.second);
+		lineIndexs.push_back((iter.first << 16) + iter.first);
+		lineIndexs.push_back((iter.second << 16) + iter.second);
 		numLine++;
 	}
 }
@@ -149,14 +147,28 @@ bool ShortCutTree::handleShortCutNode(ShortCutNode& fa, ShortCutNode& nowTreeNod
 }
 
 void ShortCutTree::simplifyLineVector() {
+	bool canPut = false;
+	GLuint index = 0;
 	numLine = allLines.size();
 	for (auto& nowLine : allLines) {
 		PointVector pointVector = nowLine->toPointVector();
+		canPut = false;
+		index = 0;
 		for (Point& p : pointVector) {
 			int pointIndex = getPointIndex(p);
-			lineIndexs.push_back(pointIndex);
-			if (pointVector.size() == 2)
-				lineIndexs.push_back(pointIndex);
+			if (pointVector.size() == 2) {
+				index = (pointIndex << 16) + pointIndex;
+				lineIndexs.push_back(index);
+			}
+			else {
+				index <<= 16;
+				index += pointIndex;
+				if (canPut) {
+					lineIndexs.push_back(index);
+					index = 0;
+				}
+				canPut = !canPut;
+			}
 		}
 	}
 	for (auto& nowTreeNode : restOfTreeNodes) {