diff --git a/SourceCode/Code2026/CoreLibrary/AecDbEwPipeBase.cpp b/SourceCode/Code2026/CoreLibrary/AecDbEwPipeBase.cpp
index f0aa582..e790717 100644
--- a/SourceCode/Code2026/CoreLibrary/AecDbEwPipeBase.cpp
+++ b/SourceCode/Code2026/CoreLibrary/AecDbEwPipeBase.cpp
@@ -658,6 +658,40 @@ namespace
 
 		return es != Acad::eOk;
 	}
+
+	// 读端只接受纯文件名：DWG 里存的名字不可信，去掉路径成分防止写到临时目录之外
+	CString SanitizeRegionTempName(const CString& sFileName)
+	{
+		CString sName = sFileName;
+
+		int nSlash = sName.ReverseFind(_T('\\'));
+		int nSlash2 = sName.ReverseFind(_T('/'));
+		if (nSlash2 > nSlash)
+			nSlash = nSlash2;
+
+		if (nSlash >= 0)
+			sName = sName.Mid(nSlash + 1);
+
+		// 空名、上跳目录、盘符一律丢弃，退回固定名
+		if (sName.IsEmpty() || sName.Find(_T("..")) >= 0 || sName.Find(_T(':')) >= 0)
+			sName = _T("region_tmp.dat");
+
+		return sName;
+	}
+
+	// acisOut 不可用时的兜底：写 errorfile 标记，再让 region 自己写原生数据
+	Acad::ErrorStatus WriteRegionNativeFallback(AcDbDwgFiler* pFiler, AcDbRegion* pRegion)
+	{
+		pFiler->writeString(_T("errorfile"));
+
+		char pszTxt[7];
+		::memset(pszTxt, 0, sizeof(pszTxt));
+
+		pFiler->writeUInt32(7);
+		pFiler->writeBytes(pszTxt, 7);
+
+		return pRegion->dwgOutFields(pFiler);
+	}
 }
 
 AcDbRegion *AecDbEwPipeBase::RegionFromCurvesDwgInFields(AcDbDwgFiler *pFiler, Adesk::UInt32 nLen)
@@ -760,66 +794,92 @@ AcDbRegion* AecDbEwPipeBase::RegionAcisInDwgInFields(AcDbDwgFiler* pFiler)
 	//高版本acis方式
 	CString sFileName;
 	TCHAR* pszFileName = NULL;
-	pFiler->readString(&pszFileName);
-	if (pszFileName != NULL)
+	if (pFiler->readString(&pszFileName) != Acad::eOk || pszFileName == NULL)
 	{
-		//Region_%s.dat
-		sFileName = pszFileName;
-		acutDelString(pszFileName);
-
-		Adesk::UInt32 nLen = 0;
-		pFiler->readUInt32(&nLen);
-
-		if (nLen > 0)
-		{
-			char* pszTxt = new char[nLen];
-			pFiler->readBytes(pszTxt,nLen);
-
-			if (sFileName.CompareNoCase(_T("errorfile")) == 0)
-			{
-				//原生写法
-				AcDbRegion* pRegion = (AcDbRegion*)AcDbRegion::desc()->create();
-				Acad::ErrorStatus es = pRegion->dwgInFields(pFiler);
-				
-				return pRegion;
-			}
-			else
-			{
-				CString sFullPath = FilePath::getSystemTemporaryFolder();
-				sFullPath += _T("\\");
-				sFullPath += sFileName;
-
-				CFile file;
-				if (file.Open(sFullPath, CFile::modeCreate | CFile::modeWrite))
-				{
-					file.Write(pszTxt,nLen);
-					file.Close();
-
-					AcDbVoidPtrArray arBodyPtrs;
-					Acad::ErrorStatus es;
-					if ( Acad::eOk == (es = AcDbBody::acisIn(sFullPath,arBodyPtrs) ) )
-					{
-						if (arBodyPtrs.length() > 0)
-						{
-							AcDbEntity* pEnt = (AcDbEntity*)arBodyPtrs.first();
-							AcDbRegion* pRegion = AcDbRegion::cast(pEnt);
-							if (pRegion != NULL)
-							{
-								::DeleteFile(sFullPath);
-								delete[] pszTxt;
-
-								return pRegion;
-							}
-							//可能其他的合成或boolsubstract...
-						}
-					}
-					::DeleteFile(sFullPath);
-				}
-			}
-			delete[] pszTxt;
-		}
+		acutPrintf(_T("\nAecDbEwPipeBase: 截面读文件名失败。"));
+		return NULL;
 	}
-	return NULL;
+
+	//Region_%s.dat
+	sFileName = pszFileName;
+	acutDelString(pszFileName);
+
+	Adesk::UInt32 nLen = 0;
+	pFiler->readUInt32(&nLen);
+
+	if (nLen == 0)
+		return NULL;
+
+	char* pszTxt = new char[nLen + 1];
+	::memset(pszTxt, 0, nLen + 1);
+	pFiler->readBytes(pszTxt,nLen);
+
+	if (sFileName.CompareNoCase(_T("errorfile")) == 0)
+	{
+		//原生写法
+		delete[] pszTxt;
+
+		AcDbRegion* pRegion = (AcDbRegion*)AcDbRegion::desc()->create();
+		if (pRegion == NULL)
+		{
+			acutPrintf(_T("\nAecDbEwPipeBase: 截面原生读取时创建 region 失败。"));
+			return NULL;
+		}
+
+		Acad::ErrorStatus es = pRegion->dwgInFields(pFiler);
+		if (es != Acad::eOk)
+		{
+			acutPrintf(_T("\nAecDbEwPipeBase: 截面原生 dwgInFields 失败，err=%d。"),es);
+			delete pRegion;
+			return NULL;
+		}
+		return pRegion;
+	}
+
+	CString sFullPath = FilePath::getSystemTemporaryFolder();
+	sFullPath += _T("\\");
+	sFullPath += SanitizeRegionTempName(sFileName);
+
+	CFile file;
+	if (!file.Open(sFullPath, CFile::modeCreate | CFile::modeWrite))
+	{
+		acutPrintf(_T("\nAecDbEwPipeBase: 截面临时文件创建失败：%s"),(LPCTSTR)sFullPath);
+		delete[] pszTxt;
+		return NULL;
+	}
+
+	file.Write(pszTxt,nLen);
+	file.Close();
+	delete[] pszTxt;
+
+	AcDbVoidPtrArray arBodyPtrs;
+	Acad::ErrorStatus es = AcDbBody::acisIn(sFullPath,arBodyPtrs);
+	if (es != Acad::eOk)
+	{
+		acutPrintf(_T("\nAecDbEwPipeBase: 截面 acisIn 失败，len=%u，err=%d。"),nLen,es);
+		::DeleteFile(sFullPath);
+		return NULL;
+	}
+
+	// acisIn 返回的实体未入库，由调用方负责释放；只留第一个 region，其余丢弃
+	AcDbRegion* pRegion = NULL;
+	for (int i = 0;i < arBodyPtrs.length();i++)
+	{
+		AcDbEntity* pEnt = (AcDbEntity*)arBodyPtrs.at(i);
+		if (pRegion == NULL)
+		{
+			pRegion = AcDbRegion::cast(pEnt);
+			if (pRegion != NULL)
+				continue;
+		}
+		delete pEnt;
+	}
+
+	if (pRegion == NULL)
+		acutPrintf(_T("\nAecDbEwPipeBase: 截面 acisIn 未返回 region，len=%u。"),nLen);
+
+	::DeleteFile(sFullPath);
+	return pRegion;
 }
 
 AcDbRegion* AecDbEwPipeBase::SectionRegionDwgInFields(AcDbDwgFiler* pFiler,int nVer)
@@ -1132,34 +1192,19 @@ Acad::ErrorStatus AecDbEwPipeBase::BaseCurveDwgOutFields(AcDbCurve* pBaseCurve,A
 	return Acad::eOk;
 }
 
-Acad::ErrorStatus AecDbEwPipeBase::RegionExplodeDwgOutFields(AcDbDwgFiler* pFiler,AcDbVoidPtrArray& arCurPtrs) const
-{
-	Adesk::UInt32 nCurs = arCurPtrs.length();
-	pFiler->writeUInt32(nCurs);
-
-	AcDbCurve* pCurve = NULL;
-	for (int i = 0;i < arCurPtrs.length();i++)
-	{
-		pCurve = (AcDbCurve*)arCurPtrs.at(i);
-		BaseCurveDwgOutFields(pCurve,pFiler);
-		delete pCurve;
-	}
-	return Acad::eOk;
-}
-
 Acad::ErrorStatus AecDbEwPipeBase::RegionAcisoutDwgOutFields(AcDbDwgFiler* pFiler) const
 {
 	if (m_pRegion == NULL)
 		return Acad::eInvalidInput;
 
 	//开始写acis方式
-	//避免多文档crash
+	//避免多文档crash：文件名带进程号，同一张图在两个 CAD 实例里同时打开不会互相覆盖
 	TCHAR szHandleStr[19];
 	memset(szHandleStr,0,sizeof(szHandleStr) );
 	objectId().handle().getIntoAsciiBuffer(szHandleStr);
 
 	CString sFileName;
-	sFileName.Format(_T("Region_%s.dat"),szHandleStr);
+	sFileName.Format(_T("Region_%lu_%s.dat"),(unsigned long)::GetCurrentProcessId(),szHandleStr);
 
 	CString sFullPath = FilePath::getSystemTemporaryFolder();
 	sFullPath += _T("\\");
@@ -1168,110 +1213,67 @@ Acad::ErrorStatus AecDbEwPipeBase::RegionAcisoutDwgOutFields(AcDbDwgFiler* pFile
 	AcDbVoidPtrArray arBodyPtrs;
 	arBodyPtrs.append(m_pRegion);
 
-	Acad::ErrorStatus es;
-	if (Acad::eOk == (es = AcDbBody::acisOut(sFullPath, arBodyPtrs)))
+	Acad::ErrorStatus es = AcDbBody::acisOut(sFullPath, arBodyPtrs);
+	if (Acad::eOk != es)
 	{
-		CFile file;
-		if (file.Open(sFullPath, CFile::modeRead))
-		{
-			//确认REGION不会超过32位数量级字节
-			//强制转换兼容可能的07-09CAD
-			ULONGLONG dwFileLength = file.GetLength();
-			Adesk::UInt32 nLen = (Adesk::UInt32)dwFileLength;
-
-			char* pszTxt = new char[nLen];
-			file.Read(pszTxt, nLen);
-			file.Close();
-
-			pFiler->writeString((LPCTSTR)sFileName);
-			pFiler->writeUInt32(nLen);
-			pFiler->writeBytes(pszTxt,nLen);
-
-			::DeleteFile(sFullPath);
-			delete[] pszTxt;
-			return Acad::eOk;
-		}
-		else
-		{
-			pFiler->writeString(_T("errorfile"));
-
-			char* pszTxt = new char[7];
-			memset(pszTxt,0,7);
-
-			pFiler->writeUInt32(7);
-
-			pFiler->writeBytes(pszTxt,7);
-
-			//原生写法
-			es = m_pRegion->dwgOutFields(pFiler);
-
-			return es;
-		}
+		acutPrintf(_T("\nAecDbEwPipeBase: 截面 acisOut 失败，handle=%s，err=%d，改用原生写法。"),szHandleStr,es);
+		::DeleteFile(sFullPath);
+		return WriteRegionNativeFallback(pFiler, m_pRegion);
 	}
-	else
+
+	CFile file;
+	if (!file.Open(sFullPath, CFile::modeRead))
 	{
-		pFiler->writeString(_T("errorfile"));
-
-		char* pszTxt = new char[7];
-		memset(pszTxt,0,7);
-
-		pFiler->writeUInt32(7);
-
-		pFiler->writeBytes(pszTxt,7);
-
-		//原生写法
-		es = m_pRegion->dwgOutFields(pFiler);
-
-		return es;
+		acutPrintf(_T("\nAecDbEwPipeBase: 截面临时文件打开失败，handle=%s，改用原生写法。"),szHandleStr);
+		::DeleteFile(sFullPath);
+		return WriteRegionNativeFallback(pFiler, m_pRegion);
 	}
-	return Acad::eOutOfMemory;
+
+	//确认REGION不会超过32位数量级字节
+	//强制转换兼容可能的07-09CAD
+	ULONGLONG dwFileLength = file.GetLength();
+	Adesk::UInt32 nLen = (Adesk::UInt32)dwFileLength;
+
+	char* pszTxt = new char[nLen + 1];
+	::memset(pszTxt, 0, nLen + 1);
+
+	UINT nRead = file.Read(pszTxt, nLen);
+	file.Close();
+
+	if (nLen == 0 || nRead != nLen)
+	{
+		// 空文件或短读：尾部是未初始化内存，不能写进 DWG
+		acutPrintf(_T("\nAecDbEwPipeBase: 截面临时文件异常，handle=%s，期望%u字节实读%u字节，改用原生写法。")
+			,szHandleStr,nLen,nRead);
+		::DeleteFile(sFullPath);
+		delete[] pszTxt;
+		return WriteRegionNativeFallback(pFiler, m_pRegion);
+	}
+
+	pFiler->writeString((LPCTSTR)sFileName);
+	pFiler->writeUInt32(nLen);
+	pFiler->writeBytes(pszTxt,nLen);
+
+	::DeleteFile(sFullPath);
+	delete[] pszTxt;
+	return Acad::eOk;
 }
 
 Acad::ErrorStatus AecDbEwPipeBase::SectionRegionDwgOutFields(AcDbDwgFiler* pFiler,int nVer) const
 {
 	assertReadEnabled();
 
-	if (m_pRegion != NULL)
-	{
-		if (nVer < 4)//旧版本,保持原样,有错误漏洞
-		{
-			AcDbVoidPtrArray arCurPtrs;
-			m_pRegion->explode(arCurPtrs);
+	UNREFERENCED_PARAMETER(nVer);
 
-			if (!arCurPtrs.isEmpty())
-			{
-				return RegionExplodeDwgOutFields(pFiler,arCurPtrs);
-			}
-			else
-			{
-				//旧版本错误漏洞
-				//旧版本不考虑 nVer已经升级
-				//...
-			}
-		}
-		else
-		{
-			AcDbVoidPtrArray arCurPtrs;
-			m_pRegion->explode(arCurPtrs);
+	if (m_pRegion == NULL)
+		return Acad::eOk;
 
-			//如果炸碎成功
-			if (!arCurPtrs.isEmpty())
-			{
-				//轻量化写法
-				return RegionExplodeDwgOutFields(pFiler,arCurPtrs);
-			}
-			else
-			{
-				//补救措施,重量化写法
-				//写入长度0 旧版本<4 情况不考虑 nVer已经升级
-				Adesk::UInt32 nCurs = 0;
-				pFiler->writeUInt32(nCurs);
+	// 统一写 SAT：nLen = 0 是读取端识别 SAT 通道的标志，旧版本插件同样识别。
+	// 曲线通道只用于读老图纸，写路径已退役，不再按截面类型分流
+	Adesk::UInt32 nCurs = 0;
+	pFiler->writeUInt32(nCurs);
 
-				return RegionAcisoutDwgOutFields(pFiler);
-			}
-		}
-	}
-	return Acad::eOk;
+	return RegionAcisoutDwgOutFields(pFiler);
 }
 
 Acad::ErrorStatus AecDbEwPipeBase::DefaultNo()
diff --git a/SourceCode/Code2026/inc/AecDbEwPipeBase.h b/SourceCode/Code2026/inc/AecDbEwPipeBase.h
index 0af3107..02829f8 100644
--- a/SourceCode/Code2026/inc/AecDbEwPipeBase.h
+++ b/SourceCode/Code2026/inc/AecDbEwPipeBase.h
@@ -149,7 +149,6 @@ protected:
 	Acad::ErrorStatus BaseCurveDwgOutFields(AcDbCurve* pBaseCurve,AcDbDwgFiler* pFiler) const;
 
 	Acad::ErrorStatus RegionAcisoutDwgOutFields(AcDbDwgFiler* pFiler) const;
-	Acad::ErrorStatus RegionExplodeDwgOutFields(AcDbDwgFiler* pFiler,AcDbVoidPtrArray& arCurPtrs) const;
 	Acad::ErrorStatus SectionRegionDwgOutFields(AcDbDwgFiler* pFiler,int nVer) const;
 
 	Acad::ErrorStatus AddDimPoints(AcDbGripDataPtrArray& grips,const AcGeVector3d& curViewDir,