diff --git a/Port/8051/port_8051.h b/Port/8051/port_8051.h
index 96522814..130a0593 100644
--- a/Port/8051/port_8051.h
+++ b/Port/8051/port_8051.h
@@ -3,8 +3,8 @@
  * @file     port_8051.h
  * @brief    8051 Core Port File
  * @author   迟凯峰
- * @version  V3.2.0
- * @date     2024.12.13
+ * @version  V3.3.0
+ * @date     2024.12.27
  ******************************************************************************/
 
 #ifndef __PORT_8051_H
@@ -160,26 +160,24 @@ do{ \
 #define mUsedTime_END \
 do{ \
 	if(usedtime[0]){ \
-		usedtime[0]--; \
-		usedtime[1] = 65536 - usedtime[1] + counter - mSysTick_InitValue; \
+		s_task_current->usedtime[0] += usedtime[0] - 1; \
+		usedtime[0] = 0; \
+		usedtime[1] = 65536 - usedtime[1] + tick_counter - mSysTick_InitValue; \
+	} \
+	else if(tick_counter <= usedtime[1]){ \
+		usedtime[0] = ~0; \
+		usedtime[1] = 65536 - usedtime[1] + tick_counter - mSysTick_InitValue; \
 	} \
 	else{ \
-		if(counter >= usedtime[1]){ \
-			usedtime[1] = counter - usedtime[1]; \
-		} \
-		else{ \
-			usedtime[1] = 65536 - usedtime[1] + counter - mSysTick_InitValue; \
-		} \
+		usedtime[1] = tick_counter - usedtime[1]; \
 	} \
-	s_task_current->usedtime[0] += usedtime[0]; \
 	s_task_current->usedtime[0] += (s_task_current->usedtime[1] + usedtime[1]) / mSysTick_Cycle; \
 	s_task_current->usedtime[1]  = (s_task_current->usedtime[1] + usedtime[1]) % mSysTick_Cycle; \
 }while(false)
 
 #define mUsedTime_INIT \
 do{ \
-	usedtime[0] = 0; \
-	usedtime[1] = counter; \
+	usedtime[1] = tick_counter; \
 }while(false)
 
 #if SYSCFG_PENDSVFIFO_MONITOR == __ENABLED__