diff --git a/vscode/CMakeLists.txt b/vscode/CMakeLists.txt
index bb30d7d..198660d 100644
--- a/vscode/CMakeLists.txt
+++ b/vscode/CMakeLists.txt
@@ -7,7 +7,7 @@ aux_source_directory(${PROJECT_SOURCE_DIR}/FSM_OOP/baseFSM  SRC_FSM_OOP)
 
 
 # set(keytest 789)
-# set(child_parent 789) 
+set(child_parent 789) 
 if(DEFINED keytest)
     include_directories(${PROJECT_SOURCE_DIR}/FSM_OOP/keytest)
     aux_source_directory(${PROJECT_SOURCE_DIR}/FSM_OOP/keytest      SRC_FSM_USR)
diff --git a/vscode/FSM_OOP/baseFSM/FSM.c b/vscode/FSM_OOP/baseFSM/FSM.c
index 16a7770..95d6b65 100644
--- a/vscode/FSM_OOP/baseFSM/FSM.c
+++ b/vscode/FSM_OOP/baseFSM/FSM.c
@@ -92,9 +92,7 @@ void stepBaseFSM(FSM *pFSM)
         // 进子状态机，必须从默认状态开始
         if(childFSMTable[nextState] != NULL){
             FSM *cFSM = childFSMTable[nextState];
-            int cFSMNextState = cFSM->privateVars->defaultState;
-            cFSM->privateVars->fcns.enterActionTable[cFSMNextState](cFSM->data);
-            cFSM->privateVars->curState = cFSMNextState;
+            Step(cFSM);
         }
 
         pFSM->privateVars->curState = nextState;
diff --git a/vscode/FSM_OOP/childtest/ParentFSM.c b/vscode/FSM_OOP/childtest/ParentFSM.c
index 27a61db..2f73856 100644
--- a/vscode/FSM_OOP/childtest/ParentFSM.c
+++ b/vscode/FSM_OOP/childtest/ParentFSM.c
@@ -73,6 +73,7 @@ static void initDataLoader(ParentFSM *pFSM){   // 必须重新实现
  */
 static void setupHandler(FSMHandler* fcns){ // 必须重新实现
     /* ------------------------------- 添加下一个状态选择函数 ------------------------------ */
+    addSelectNextStateFcn(Idle);
     addSelectNextStateFcn(A);
     addSelectNextStateFcn(B);
     addSelectNextStateFcn(C);
@@ -131,7 +132,7 @@ void bindChildFSM(FSM *pFSM, FSM *cFSM){
  */
 ParentFSM *createParentFSM(){
     ParentFSM *pFSM;
-    pFSM = (ParentFSM *)newBaseFSM(Count_State, DEFAULT_STATE);
+    pFSM = (ParentFSM *)newBaseFSM(Count_State);
 
     // 重新实现的函数
     pFSM->base.publicFcns.step = (Avoid_WARNING_Overrider_Fcns)step;
diff --git a/vscode/FSM_OOP/childtest/ParentFSM_private.h b/vscode/FSM_OOP/childtest/ParentFSM_private.h
index b9f2683..01e059d 100644
--- a/vscode/FSM_OOP/childtest/ParentFSM_private.h
+++ b/vscode/FSM_OOP/childtest/ParentFSM_private.h
@@ -35,14 +35,17 @@ typedef enum _State
 
     Count_State, /**< 必须在结尾，用来统计状态数量 */
 } State;
-#define     DEFAULT_STATE       A /**< 默认状态，Idle状态会先跳转到默认状态 */
 
 /* -------------------------------------------------------------------------- */
 /*                         下一个状态选择函数                                 */
 /* -------------------------------------------------------------------------- */
 
 
-static State selectNextStateFcn(A)(ParentFSM *data, FSMSignals *signals){
+static State selectNextStateFcn(Idle)(ParentFSMData *data, FSMSignals *signals){
+    return A;
+}
+
+static State selectNextStateFcn(A)(ParentFSMData *data, FSMSignals *signals){
     if(getSignal(signals, Signal_toB)){
         signals->lastTriggeredSignal = Signal_toB;
         return B;
@@ -50,7 +53,7 @@ static State selectNextStateFcn(A)(ParentFSM *data, FSMSignals *signals){
     return Idle;
 }
 
-static State selectNextStateFcn(B)(ParentFSM *data, FSMSignals *signals){
+static State selectNextStateFcn(B)(ParentFSMData *data, FSMSignals *signals){
     if(getSignal(signals, Signal_toA)){
         signals->lastTriggeredSignal = Signal_toA;
         return A;
diff --git a/vscode/FSM_OOP/childtest/childFSM.c b/vscode/FSM_OOP/childtest/childFSM.c
index e795b48..42c4fd1 100644
--- a/vscode/FSM_OOP/childtest/childFSM.c
+++ b/vscode/FSM_OOP/childtest/childFSM.c
@@ -73,6 +73,7 @@ static void initDataLoader(ChildFSM *pFSM){   // 必须重新实现
  */
 static void setupHandler(FSMHandler* fcns){ // 必须重新实现
     /* ------------------------------- 添加下一个状态选择函数 ------------------------------ */
+    addSelectNextStateFcn(Idle);
     addSelectNextStateFcn(D);
     addSelectNextStateFcn(E);
 
@@ -123,7 +124,7 @@ static void step(ChildFSM* pFSM){
  */
 ChildFSM *createChildFSM(){
     ChildFSM *pFSM;
-    pFSM = (ChildFSM *)newBaseFSM(Count_State, DEFAULT_STATE);
+    pFSM = (ChildFSM *)newBaseFSM(Count_State);
 
     // 重新实现的函数
     pFSM->base.publicFcns.step = (Avoid_WARNING_Overrider_Fcns)step;
diff --git a/vscode/FSM_OOP/childtest/childFSM_private.h b/vscode/FSM_OOP/childtest/childFSM_private.h
index f3ac364..b0d46ec 100644
--- a/vscode/FSM_OOP/childtest/childFSM_private.h
+++ b/vscode/FSM_OOP/childtest/childFSM_private.h
@@ -34,14 +34,18 @@ typedef enum _State
 
     Count_State, /**< 必须在结尾，用来统计状态数量 */
 } State;
-#define     DEFAULT_STATE       D /**< 默认状态，Idle状态会先跳转到默认状态 */
 
 /* -------------------------------------------------------------------------- */
 /*                         下一个状态选择函数                                 */
 /* -------------------------------------------------------------------------- */
+static State selectNextStateFcn(Idle)(ChildFSMData *data, FSMSignals *signals){
+    if(data->external.x == 1)
+        return D;
+    else
+        return E;
+}
 
-
-static State selectNextStateFcn(D)(ChildFSM *data, FSMSignals *signals){
+static State selectNextStateFcn(D)(ChildFSMData *data, FSMSignals *signals){
     if(getSignal(signals, Signal_toE)){
         signals->lastTriggeredSignal = Signal_toE;
         return E;
@@ -49,7 +53,7 @@ static State selectNextStateFcn(D)(ChildFSM *data, FSMSignals *signals){
     return Idle;
 }
 
-static State selectNextStateFcn(E)(ChildFSM *data, FSMSignals *signals){
+static State selectNextStateFcn(E)(ChildFSMData *data, FSMSignals *signals){
     if(getSignal(signals, Signal_toD)){
         signals->lastTriggeredSignal = Signal_toD;
         return D;
diff --git a/vscode/FSM_OOP/childtest/main.c b/vscode/FSM_OOP/childtest/main.c
index 0b0fec2..0d93dae 100644
--- a/vscode/FSM_OOP/childtest/main.c
+++ b/vscode/FSM_OOP/childtest/main.c
@@ -16,6 +16,7 @@ int main(){
     pFSM = createParentFSM();
 
     registerChildFSM(pFSM, cFSM, 2);
+    ((ParentFSMData *)GetData(cFSM))->external.x = 1;
 
     for (int k = 0; k < 15; k++)
     {   
@@ -23,6 +24,10 @@ int main(){
         SetSignal(pFSM, i[k]);
         SetSignal(cFSM, j[k]);
 
+        if(k > 5){
+            ((ParentFSMData *)GetData(cFSM))->external.x = 0;
+        }
+
         Step(pFSM);