diff --git a/include/lightir/BasicBlock.hpp b/include/lightir/BasicBlock.hpp
index 01d07d825981458c5a001e8f49575e60570eeabc..bbd1c758fe5e3db2ba9c3ba13aff290245c224d1 100755
--- a/include/lightir/BasicBlock.hpp
+++ b/include/lightir/BasicBlock.hpp
@@ -30,7 +30,7 @@ class BasicBlock : public Value, public llvm::ilist_node<BasicBlock> {
     void add_succ_basic_block(BasicBlock *bb) { succ_bbs_.push_back(bb); }
     void remove_pre_basic_block(BasicBlock *bb) { pre_bbs_.remove(bb); }
     void remove_succ_basic_block(BasicBlock *bb) { succ_bbs_.remove(bb); }
-	BasicBlock* get_entry_block_of_same_function();
+	  BasicBlock* get_entry_block_of_same_function();
 
     // If the Block is terminated by ret/br
     bool is_terminated() const;
@@ -40,6 +40,9 @@ class BasicBlock : public Value, public llvm::ilist_node<BasicBlock> {
     /****************api about Instruction****************/
     void add_instruction(Instruction *instr);
     void add_instr_begin(Instruction *instr) { instr_list_.push_front(instr); }
+    void add_instr_before_end(Instruction *instr) {
+        instr_list_.insert(std::prev(instr_list_.end()), instr);
+    }
     void erase_instr(Instruction *instr) { instr_list_.erase(instr); }
     void remove_instr(Instruction *instr) { instr_list_.remove(instr); }
 
diff --git a/src/lightir/Instruction.cpp b/src/lightir/Instruction.cpp
index 693655e3ac2852530d22c5052fbc5f83d4bc08e3..c9e4b7a8d010307ed609869dacee223a46cc41d8 100755
--- a/src/lightir/Instruction.cpp
+++ b/src/lightir/Instruction.cpp
@@ -303,7 +303,10 @@ AllocaInst *AllocaInst::create_alloca_begin(Type *ty, BasicBlock *bb) {
 	if(bb != nullptr)
 	{
 		ret->set_parent(bb);
-		bb->add_instr_begin(ret);
+        if (bb->is_terminated())
+		    bb->add_instr_before_end(ret);
+        else
+            bb->add_instruction(ret);
 	}
 	return ret;
 }