diff --git a/kernel/include/los_sched.h b/kernel/include/los_sched.h
index aef3bd48..1ff08c89 100644
--- a/kernel/include/los_sched.h
+++ b/kernel/include/los_sched.h
@@ -93,11 +93,11 @@ VOID OsSchedTimerBaseReset(UINT64 currTime);
 
 STATIC INLINE UINT64 OsGetCurrSchedTimeCycle(VOID)
 {
-    if (g_sysSchedStartTime == 0) {
-        return g_sysSchedStartTime;
+    if (g_sysSchedStartTime != OS_64BIT_MAX) {
+        return (OsGetCurrSysTimeCycle() - g_sysSchedStartTime);
     }
 
-    return (OsGetCurrSysTimeCycle() - g_sysSchedStartTime);
+    return 0;
 }
 
 /**
diff --git a/kernel/src/los_sched.c b/kernel/src/los_sched.c
index d169fd72..6ee89119 100644
--- a/kernel/src/los_sched.c
+++ b/kernel/src/los_sched.c
@@ -60,13 +60,11 @@ STATIC UINT16 g_tickIntLock = 0;
 STATIC UINT64 g_tickStartTime = 0;
 STATIC UINT64 g_schedResponseTime = OS_SCHED_MAX_RESPONSE_TIME;
 STATIC VOID (*SchedRealSleepTimeSet)(UINT64) = NULL;
-UINT64 g_sysSchedStartTime = 0;
+UINT64 g_sysSchedStartTime = OS_64BIT_MAX;
 
 STATIC VOID OsSchedSetStartTime(UINT64 currCycle)
 {
-    if (g_sysSchedStartTime == 0) {
-        g_sysSchedStartTime = currCycle;
-    }
+    g_sysSchedStartTime = currCycle;
 }
 
 UINT32 OsSchedRealSleepTimeSet(VOID (*func)(UINT64))
@@ -483,8 +481,10 @@ VOID OsSchedStart(VOID)
     g_losTask.newTask = newTask;
     g_losTask.runTask = g_losTask.newTask;
 
-    g_taskScheduled = 1;
+    /* Initialize the schedule timeline and enable scheduling */
+    g_taskScheduled = TRUE;
     OsSchedSetStartTime(OsGetCurrSysTimeCycle());
+
     newTask->startTime = OsGetCurrSchedTimeCycle();
     OsSchedTaskDeQueue(newTask);
 
diff --git a/utils/los_compiler.h b/utils/los_compiler.h
index fc36cc9f..d5b2cdee 100644
--- a/utils/los_compiler.h
+++ b/utils/los_compiler.h
@@ -354,6 +354,7 @@ typedef signed int             INTPTR;
 #define OS_FAIL       1
 #define OS_ERROR      (UINT32)(-1)
 #define OS_INVALID    (UINT32)(-1)
+#define OS_64BIT_MAX  (0xFFFFFFFFFFFFFFFFULL)
 
 #define asm           __asm
 #ifdef typeof