diff --git a/board/TencentOS_tiny_EVB_MX_Plus/KEIL/hello_world/TencentOS_tiny.uvoptx b/board/TencentOS_tiny_EVB_MX_Plus/KEIL/hello_world/TencentOS_tiny.uvoptx
index 9e348f367193a913e179e1f76d6a26393077be90..17eb887448f960c17a8d13b2bd27af07f9773699 100644
--- a/board/TencentOS_tiny_EVB_MX_Plus/KEIL/hello_world/TencentOS_tiny.uvoptx
+++ b/board/TencentOS_tiny_EVB_MX_Plus/KEIL/hello_world/TencentOS_tiny.uvoptx
@@ -152,25 +152,25 @@
         <Bp>
           <Number>0</Number>
           <Type>0</Type>
-          <LineNumber>28</LineNumber>
+          <LineNumber>245</LineNumber>
           <EnabledFlag>1</EnabledFlag>
-          <Address>134231898</Address>
+          <Address>134229606</Address>
           <ByteObject>0</ByteObject>
           <HtxType>0</HtxType>
           <ManyObjects>0</ManyObjects>
           <SizeOfObject>0</SizeOfObject>
           <BreakByAccess>0</BreakByAccess>
           <BreakIfRCount>1</BreakIfRCount>
-          <Filename>..\..\..\..\examples\hello_world\hello_world.c</Filename>
+          <Filename>..\..\..\..\arch\arm\arm-v7m\common\tos_cpu.c</Filename>
           <ExecCommand></ExecCommand>
-          <Expression>\\TencentOS_tiny\../../../../examples/hello_world/hello_world.c\28</Expression>
+          <Expression>\\TencentOS_tiny\../../../../arch/arm/arm-v7m/common/tos_cpu.c\245</Expression>
         </Bp>
         <Bp>
           <Number>1</Number>
           <Type>0</Type>
-          <LineNumber>245</LineNumber>
+          <LineNumber>251</LineNumber>
           <EnabledFlag>1</EnabledFlag>
-          <Address>134229606</Address>
+          <Address>134229624</Address>
           <ByteObject>0</ByteObject>
           <HtxType>0</HtxType>
           <ManyObjects>0</ManyObjects>
@@ -179,23 +179,23 @@
           <BreakIfRCount>1</BreakIfRCount>
           <Filename>..\..\..\..\arch\arm\arm-v7m\common\tos_cpu.c</Filename>
           <ExecCommand></ExecCommand>
-          <Expression>\\TencentOS_tiny\../../../../arch/arm/arm-v7m/common/tos_cpu.c\245</Expression>
+          <Expression>\\TencentOS_tiny\../../../../arch/arm/arm-v7m/common/tos_cpu.c\251</Expression>
         </Bp>
         <Bp>
           <Number>2</Number>
           <Type>0</Type>
-          <LineNumber>251</LineNumber>
+          <LineNumber>28</LineNumber>
           <EnabledFlag>1</EnabledFlag>
-          <Address>134229624</Address>
+          <Address>0</Address>
           <ByteObject>0</ByteObject>
           <HtxType>0</HtxType>
           <ManyObjects>0</ManyObjects>
           <SizeOfObject>0</SizeOfObject>
           <BreakByAccess>0</BreakByAccess>
-          <BreakIfRCount>1</BreakIfRCount>
-          <Filename>..\..\..\..\arch\arm\arm-v7m\common\tos_cpu.c</Filename>
+          <BreakIfRCount>0</BreakIfRCount>
+          <Filename>..\..\..\..\examples\hello_world\hello_world.c</Filename>
           <ExecCommand></ExecCommand>
-          <Expression>\\TencentOS_tiny\../../../../arch/arm/arm-v7m/common/tos_cpu.c\251</Expression>
+          <Expression></Expression>
         </Bp>
       </Breakpoint>
       <WatchWindow1>
@@ -835,7 +835,7 @@
 
   <Group>
     <GroupName>kernel</GroupName>
-    <tvExp>1</tvExp>
+    <tvExp>0</tvExp>
     <tvExpOptDlg>0</tvExpOptDlg>
     <cbSel>0</cbSel>
     <RteFlg>0</RteFlg>
diff --git a/board/TencentOS_tiny_EVB_MX_Plus/KEIL/hello_world/TencentOS_tiny.uvprojx b/board/TencentOS_tiny_EVB_MX_Plus/KEIL/hello_world/TencentOS_tiny.uvprojx
index 3de07e320e7dc77bbc6617e6d4ad03d29124a422..a85fd8093f32b8f3c83979d1107f6560456fa455 100644
--- a/board/TencentOS_tiny_EVB_MX_Plus/KEIL/hello_world/TencentOS_tiny.uvprojx
+++ b/board/TencentOS_tiny_EVB_MX_Plus/KEIL/hello_world/TencentOS_tiny.uvprojx
@@ -16,7 +16,7 @@
         <TargetCommonOption>
           <Device>STM32L431RCTx</Device>
           <Vendor>STMicroelectronics</Vendor>
-          <PackID>Keil.STM32L4xx_DFP.2.4.0</PackID>
+          <PackID>Keil.STM32L4xx_DFP.2.3.0</PackID>
           <PackURL>https://www.keil.com/pack/</PackURL>
           <Cpu>IRAM(0x20000000-0x2000FFFF) IROM(0x8000000-0x803FFFF) CLOCK(8000000) FPU2 CPUTYPE("Cortex-M4")</Cpu>
           <FlashUtilSpec></FlashUtilSpec>
diff --git a/kernel/core/include/tos_task.h b/kernel/core/include/tos_task.h
index f2a66e5016a754382242c79aa08fa1081aeeddd2..db7b48e0748a962c180b429eaaec9ba5373f475e 100644
--- a/kernel/core/include/tos_task.h
+++ b/kernel/core/include/tos_task.h
@@ -20,7 +20,8 @@
 
 __CDECLS_BEGIN
 
-#define K_TASK_NAME_MAX                 (16u)
+#define K_TASK_NAME_LEN_MAX             (15u)
+#define K_TASK_NAME_MAX                 (K_TASK_NAME_LEN_MAX + 1)
 #define K_TASK_STK_SIZE_MIN             (sizeof(cpu_context_t))
 
 // task state is just a flag, indicating which manager list we are in.
diff --git a/kernel/core/tos_task.c b/kernel/core/tos_task.c
index b91f83604eef719df3f481bfb26a41948dbb14f7..496de2c29935c59e4ee2207c97b2f1e56723bf17 100644
--- a/kernel/core/tos_task.c
+++ b/kernel/core/tos_task.c
@@ -125,7 +125,7 @@ __API__ k_err_t tos_task_create(k_task_t *task,
     task->prio      = prio;
     task->stk_base  = stk_base;
     task->stk_size  = stk_size;
-    strncpy(task->name, name, K_TASK_NAME_MAX);
+    strncpy(task->name, name, K_TASK_NAME_LEN_MAX);
 
 #if TOS_CFG_ROUND_ROBIN_EN > 0u
     task->timeslice_reload = timeslice;