diff --git a/SourceCode/Code2026/AecRxBase/GiDrawUtility.cpp b/SourceCode/Code2026/AecRxBase/GiDrawUtility.cpp
index dc97d48..ea4b36b 100644
--- a/SourceCode/Code2026/AecRxBase/GiDrawUtility.cpp
+++ b/SourceCode/Code2026/AecRxBase/GiDrawUtility.cpp
@@ -111,6 +111,22 @@ namespace
 		return true;
 	}
 
+	// createFromCurves 可能返回多个 region（自交轮廓等），只保留第一个，其余就地释放
+	AcDbRegion* TakeFirstRegion(AcDbVoidPtrArray &regions)
+	{
+		if (regions.isEmpty()) return NULL;
+
+		AcDbRegion *pFirst = (AcDbRegion *)regions.first();
+		regions.removeFirst();
+		while (!regions.isEmpty())
+		{
+			AcDbRegion *p = (AcDbRegion *)regions.last();
+			regions.removeLast();
+			delete p;
+		}
+		return pFirst;
+	}
+
 	AcDbRegion* createRegion(AcDbEntity *pEnt)
 	{
 		AcDbVoidPtrArray arr, segs;
@@ -121,7 +137,7 @@ namespace
 		{
 			return NULL;
 		}
-		return (AcDbRegion*)segs[0];
+		return TakeFirstRegion(segs);
 	}
 
 	
@@ -176,10 +192,9 @@ AECDLLIMPEXP AcGeMatrix3d GiDrawUtility::RotateAndMove(const AcGeVector3d &vtOri
 	, const AcGeVector3d &vtDist
 	, const AcGePoint3d &ptDist)
 {
-	AcGeVector3d _vtOrig(vtOrig);
-	AcGeVector3d _vtDist(vtDist);
-	_vtOrig *= 1;// 保证长度不为0
-	_vtDist *= 1;// 保证长度不为0
+	// 零向量无法确定旋转方向，退化为 Z 轴（与本函数既有调用都以 Z 轴为基准一致）
+	AcGeVector3d _vtOrig(vtOrig.isZeroLength() ? AcGeVector3d::kZAxis : vtOrig);
+	AcGeVector3d _vtDist(vtDist.isZeroLength() ? AcGeVector3d::kZAxis : vtDist);
 	AcGeMatrix3d mat(AcGeMatrix3d::kIdentity);
 	//mat = _vtDist.rotateTo(_vtOrig);
 	mat = _vtOrig.rotateTo(_vtDist);
@@ -292,9 +307,7 @@ AECDLLIMPEXP AcDbEntity* GiDrawUtility::DrawRevolve(const AcDbLine& lnAxis
 	AcDbRegion *pReg = createRegion(_pC);
 	if (!pReg)
 	{
-		//DELETE_PTR(_pC);
-		_pC->setColorIndex(1);
-		AddToModelSpace(_pC);
+		DELETE_PTR(_pC);
 		return NULL;
 	}
 	AcDbEntity *p = DrawRevolve(lnAxis, pReg);
@@ -351,6 +364,13 @@ AECDLLIMPEXP AcDbEntity* GiDrawUtility::DrawMesh( const Adesk::UInt32 &rows
 	, const AcGePoint3d *pVertexList
 	, bool bHasSeal /* = true*/)
 {
+	// rows 少于 2 时没有可放样的截面，columns 少于 3 时截面不构成闭合轮廓
+	if (!pVertexList || rows < 2 || columns < 3)
+	{
+		acutPrintf(_T("\nDrawMesh 参数无效:rows=%u, columns=%u."), rows, columns);
+		return NULL;
+	}
+
 	// 去掉头尾两个无效面
 	int first = 1, last = rows - 1;
 	if (!bHasSeal)
@@ -589,6 +609,10 @@ AECDLLIMPEXP AcDbEntity* GiDrawUtility::DrawTydf(const AcGePoint3d &ptPos
 		cir.transformBy(xForm1);
 		ptTop.transformBy(xForm1);
 
+		// 两个截面已各自平移，引导线须重新连到变换后的截面中心
+		line.setStartPoint(ptBottom);
+		line.setEndPoint(ptTop);
+
 		p = DrawLoft(&plBottom, &cir, &line);
 	}
 	else
@@ -673,19 +697,19 @@ AECDLLIMPEXP AcDbEntity* GiDrawUtility::DrawDish(const double &dH	/*小半径*/
 	arCurves.append(&elArc);
 	if (AcDbRegion::createFromCurves(arCurves, arRegs) != Acad::eOk)
 		return NULL;
-	if (arRegs.isEmpty()) return NULL;
+	AcDbRegion *pReg = TakeFirstRegion(arRegs);
+	if (!pReg) return NULL;
 
 	AcDbEntity *p = DrawRevolve(
 		AcDbLine(AcGePoint3d::kOrigin , AcGePoint3d::kOrigin + AcGeVector3d::kZAxis * 1)
-		, (AcDbRegion*)arRegs[0]);
+		, pReg);
+	DELETE_PTR(pReg);
 	
 	if (!p) return NULL;
 
 	AcGeMatrix3d mat = RotateAndMove(AcGeVector3d::kZAxis, AcGePoint3d::kOrigin, axisDir, axisPnt);
 	p->transformBy(mat);
 
-	AcDbEntity *pDel((AcDbEntity*)arRegs[0]);
-	DELETE_PTR(pDel);
 	return p;
 }
 
@@ -830,9 +854,7 @@ AcDbEntity* GiDrawUtility::DrawPipe(const AcDbCurve *pCurve, double dR)
 	arCurPts.append(&cir);
 
 	AcDbRegion::createFromCurves(arCurPts, arRegs);
-	if (arRegs.isEmpty()) return NULL;
-
-	AcDbRegion *pReg = (AcDbRegion *)arRegs.first();
+	AcDbRegion *pReg = TakeFirstRegion(arRegs);
 	if (!pReg) return NULL;
 
 	Acad::ErrorStatus es;