diff --git a/src/PikaObj.c b/src/PikaObj.c
index 294577ac1..3c98950a5 100644
--- a/src/PikaObj.c
+++ b/src/PikaObj.c
@@ -1807,8 +1807,8 @@ void obj_dump(PikaObj* self) {
 #if !PIKA_KERNAL_DEBUG_ENABLE
     return;
 #else
-    pika_platform_printf("[%s]", self->name);
-    pika_platform_printf("\t\t@%p", self);
+    pika_platform_printf("[\033[32m%s\033[0m]", self->name);
+    pika_platform_printf(" \033[36m@%p\033[0m", self);
     pika_platform_printf("\r\n");
 #endif
 }
@@ -1826,8 +1826,8 @@ uint32_t pikaGC_markSweepOnce(PikaGC* gc) {
         obj = obj->gcNext;
     }
     if (count > 0) {
-        pikaGC_markDump();
-        pikaGC_printFreeList();
+        // pikaGC_markDump();
+        // pikaGC_printFreeList();
         for (uint32_t i = 0; i < count; i++) {
             obj_GC(freeList[i]);
         }
@@ -1901,7 +1901,7 @@ void pikaGC_mark(void) {
 
 int _pikaGC_markDumpHandler(PikaGC* gc) {
     for (uint32_t i = 0; i < gc->markDeepth - 1; i++) {
-        pika_platform_printf("  ");
+        pika_platform_printf("  |");
     }
     if (gc->markDeepth != 1) {
         pika_platform_printf("- ");
@@ -1910,13 +1910,6 @@ int _pikaGC_markDumpHandler(PikaGC* gc) {
     return 0;
 }
 
-void pikaGC_markDump(void) {
-    PikaGC gc = {0};
-    pika_platform_printf("========= PIKA GC DUMP =========\r\n");
-    gc.onMarkObj = _pikaGC_markDumpHandler;
-    _pikaGC_mark(&gc);
-}
-
 #endif
 
 PIKA_BOOL obj_checkAlive(PikaObj* self) {
@@ -1959,6 +1952,9 @@ uint32_t pikaGC_markSweep(void) {
     while (pikaGC_markSweepOnce(&gc) != 0) {
         count++;
     };
+    if (count > 0) {
+        // pikaGC_markDump();
+    }
     /* update gc state */
     g_PikaObjState.objCntLastGC = g_PikaObjState.objCnt;
     pikaGC_unlock();
@@ -1966,6 +1962,20 @@ uint32_t pikaGC_markSweep(void) {
 #endif
 }
 
+void pikaGC_markDump(void) {
+#if !PIKA_GC_MARK_SWEEP_ENABLE
+    return;
+#else
+    PikaGC gc = {0};
+    pika_platform_printf(
+        "\033[31m"
+        "========= PIKA GC DUMP =========\r\n"
+        "\033[0m");
+    gc.onMarkObj = _pikaGC_markDumpHandler;
+    _pikaGC_mark(&gc);
+#endif
+}
+
 void pikaGC_checkThreshold(void) {
 #if !PIKA_GC_MARK_SWEEP_ENABLE
     return;
diff --git a/src/PikaVM.c b/src/PikaVM.c
index 1958b44ae..df67ecbc7 100644
--- a/src/PikaVM.c
+++ b/src/PikaVM.c
@@ -451,11 +451,9 @@ static int32_t VMState_getAddrOffsetOfContinue(VMState* vm) {
 static void VMState_delLReg(VMState* vm, uint8_t index) {
     PikaObj* obj = vm->lreg[index];
     if (NULL != obj) {
-        obj_refcntDec(obj);
+        obj_enableGC(obj);
         vm->lreg[index] = NULL;
-        if (0 == obj_refcntNow(obj)) {
-            obj_deinit(obj);
-        }
+        obj_GC(obj);
     }
 }
 
@@ -1604,8 +1602,10 @@ static Arg* VM_instruction_handler_RET(PikaObj* self,
                                        Arg* arg_ret_reg) {
     /* exit jmp signal */
     vm->jmp = VM_JMP_EXIT;
-    Arg* return_arg = stack_popArg_alloc(&(vm->stack));
-    method_returnArg(vm->locals->list, return_arg);
+    Arg* aReturn = stack_popArg_alloc(&(vm->stack));
+    /* set gc root to avoid gc */
+    arg_setObjFlag(aReturn, OBJ_FLAG_GC_ROOT);
+    method_returnArg(vm->locals->list, aReturn);
     return NULL;
 }
 
@@ -2909,18 +2909,19 @@ static Arg* VM_instruction_handler_DEL(PikaObj* self,
     if (_checkLReg(data)) {
         uint8_t reg_index = _getLRegIndex(data);
         VMState_delLReg(vm, reg_index);
-        return NULL;
+        goto __exit;
     }
     if (obj_isArgExist(vm->locals, data)) {
         obj_removeArg(vm->locals, data);
-        return NULL;
+        goto __exit;
     }
     if (obj_isArgExist(vm->globals, data)) {
         obj_removeArg(vm->globals, data);
-        return NULL;
+        goto __exit;
     }
     VMState_setErrorCode(vm, PIKA_RES_ERR_OPERATION_FAILED);
     pika_platform_printf("NameError: name '%s' is not defined\n", data);
+__exit:
     return NULL;
 }
 
diff --git a/test/pikaui-test.cpp b/test/pikaui-test.cpp
index 1708436a4..ac45cf080 100644
--- a/test/pikaui-test.cpp
+++ b/test/pikaui-test.cpp
@@ -1,6 +1,7 @@
 #include "test_common.h"
 TEST_START
-#if !PIKA_NANO_ENABLE && 0
+
+#if PIKA_GC_MARK_SWEEP_ENABLE
 
 TEST(pikaui, page) {
     /* init */
diff --git a/test/python/PikaUI/PikaUI.py b/test/python/PikaUI/PikaUI.py
index 46da42917..8dbcab310 100644
--- a/test/python/PikaUI/PikaUI.py
+++ b/test/python/PikaUI/PikaUI.py
@@ -44,7 +44,8 @@ class Widget:
 
     def _set_perent(self, parent):
         # use weakref to avoid circular reference
-        self.parent = weakref.ref(parent)
+        # self.parent = weakref.ref(parent)
+        self.parent = parent
 
     def update(self):
         if self.needbuild:
diff --git a/test/python/PikaUI/test_page.py b/test/python/PikaUI/test_page.py
index 9ed23cd88..c750644a6 100644
--- a/test/python/PikaUI/test_page.py
+++ b/test/python/PikaUI/test_page.py
@@ -59,18 +59,17 @@ class Page2(ui.Page):
 
 
 app = ui.App()
-page1 = Page1()
-page1.add(page1.build())
 app.pageManager.enter(Page2())
 app.timer.cb(0)
-# mem.now()
-# app.pageManager.enter(Page2())
-# app.timer.cb(0)
-# mem.now()
-# app.pageManager.back()
-# app.timer.cb(0)
-# mem.now()
+mem.now()
+app.pageManager.enter(Page2())
+app.timer.cb(0)
+mem.now()
+app.pageManager.back()
+app.timer.cb(0)
+mem.now()
 
+gcdump()
 
 # for i in range(100):
 #     app.pageManager.enter(Page2())