diff --git a/src/midend/Pass/Optimize/SysYIRCFGOpt.cpp b/src/midend/Pass/Optimize/SysYIRCFGOpt.cpp
index 3477864..3f9ffe1 100644
--- a/src/midend/Pass/Optimize/SysYIRCFGOpt.cpp
+++ b/src/midend/Pass/Optimize/SysYIRCFGOpt.cpp
@@ -116,7 +116,8 @@ bool SysYCFGOptUtils::SysYBlockMerge(Function *func) {
           // 用usedelete删除会导致use关系被删除我只希望移动指令到当前块
           // institer = SysYIROptUtils::usedelete(institer);
           // institer = nextBlock->getInstructions().erase(institer);
-          nextBlock->moveInst(institer, block->getInstructions().end(), block);
+          institer = nextBlock->moveInst(institer, block->getInstructions().end(), block);
+          
         }
         // 更新前驱后继关系，类似树节点操作
         block->removeSuccessor(nextBlock);