diff --git a/components/dynlink/los_dynlink.c b/components/dynlink/los_dynlink.c
index 8d503a85..145aa0de 100644
--- a/components/dynlink/los_dynlink.c
+++ b/components/dynlink/los_dynlink.c
@@ -41,12 +41,6 @@
 #include "los_debug.h"
 #include "los_mux.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 #if (LOSCFG_DYNLINK == 1)
 
 #if defined(__ICCARM__) || defined(__CC_ARM)
@@ -929,10 +923,3 @@ INT32 LOS_DynlinkInit(VOID)
 }
 
 #endif /* LOSCFG_DYNLINK */
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
diff --git a/components/trace/cnv/trace_cnv.c b/components/trace/cnv/trace_cnv.c
index 30416334..b537a08d 100644
--- a/components/trace/cnv/trace_cnv.c
+++ b/components/trace/cnv/trace_cnv.c
@@ -39,12 +39,6 @@
 #include "los_swtmr.h"
 #include "los_hook.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 STATIC VOID LOS_TraceMemInit(VOID *pool, UINT32 size)
 {
     LOS_TRACE(MEM_INFO_REQ, pool);
@@ -264,9 +258,3 @@ VOID OsTraceCnvInit(VOID)
     LOS_HookReg(LOS_HOOK_TYPE_SWTMR_START, LOS_TraceSwtmrStart);
     LOS_HookReg(LOS_HOOK_TYPE_SWTMR_STOP, LOS_TraceSwtmrStop);
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
diff --git a/components/trace/los_trace.c b/components/trace/los_trace.c
index 23241e87..4abc3900 100644
--- a/components/trace/los_trace.c
+++ b/components/trace/los_trace.c
@@ -45,12 +45,6 @@
 #include "shell.h"
 #endif
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 #if (LOSCFG_KERNEL_TRACE == 1)
 LITE_OS_SEC_BSS STATIC UINT32 g_traceEventCount;
 LITE_OS_SEC_BSS STATIC volatile enum TraceState g_traceState = TRACE_UNINIT;
@@ -426,9 +420,3 @@ SHELLCMD_ENTRY(tracedump_shellcmd,    CMD_TYPE_EX, "trace_dump", 1, (CmdCallBack
 #endif
 
 #endif /* LOSCFG_KERNEL_TRACE == 1 */
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
diff --git a/components/trace/pipeline/serial/trace_pipeline_serial.c b/components/trace/pipeline/serial/trace_pipeline_serial.c
index b7131e7c..49abecf3 100644
--- a/components/trace/pipeline/serial/trace_pipeline_serial.c
+++ b/components/trace/pipeline/serial/trace_pipeline_serial.c
@@ -32,12 +32,6 @@
 #include "trace_pipeline_serial.h"
 #include "trace_pipeline.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 #if (LOSCFG_TRACE_CONTROL_AGENT == 1)
 UINT32 SerialPipelineInit(VOID)
 {
@@ -93,9 +87,3 @@ UINT32 OsTracePipelineInit(VOID)
     OsTracePipelineReg(&g_serialOps);
     return g_serialOps.init();
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
diff --git a/components/trace/pipeline/trace_pipeline.c b/components/trace/pipeline/trace_pipeline.c
index 1e096e2d..9ea1d221 100644
--- a/components/trace/pipeline/trace_pipeline.c
+++ b/components/trace/pipeline/trace_pipeline.c
@@ -33,12 +33,6 @@
 #include "trace_tlv.h"
 #include "los_trace_pri.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 #if (LOSCFG_KERNEL_SMP == 1)
 LITE_OS_SEC_BSS SPIN_LOCK_INIT(g_pipeSpin);
 #define PIPE_LOCK(state)                   LOS_SpinLockSave(&g_pipeSpin, &(state))
@@ -154,9 +148,3 @@ UINT32 OsTraceDataWait(VOID)
 {
     return g_tracePipelineOps->wait();
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
diff --git a/components/trace/pipeline/trace_tlv.c b/components/trace/pipeline/trace_tlv.c
index fd89da4c..3fbc409c 100644
--- a/components/trace/pipeline/trace_tlv.c
+++ b/components/trace/pipeline/trace_tlv.c
@@ -32,12 +32,6 @@
 #include "trace_tlv.h"
 #include "securec.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 #define CRC_WIDTH  8
 #define CRC_POLY   0x1021
 #define CRC_TOPBIT 0x8000
@@ -114,9 +108,3 @@ UINT32 OsTraceDataEncode(UINT8 type, const TlvTable *table, UINT8 *src, UINT8 *d
     head->crc      = crc;
     return len + sizeof(TraceMsgTlvHead);
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
diff --git a/components/trace/trace_offline.c b/components/trace/trace_offline.c
index 71c408bd..75602e92 100644
--- a/components/trace/trace_offline.c
+++ b/components/trace/trace_offline.c
@@ -32,12 +32,6 @@
 #include "los_trace_pri.h"
 #include "trace_pipeline.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 #if (LOSCFG_RECORDER_MODE_OFFLINE == 1)
 #define BITS_NUM_FOR_TASK_ID 16
 
@@ -257,9 +251,3 @@ OfflineHead *OsTraceRecordGet(VOID)
 }
 
 #endif /* LOSCFG_RECORDER_MODE_OFFLINE == 1 */
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
diff --git a/components/trace/trace_online.c b/components/trace/trace_online.c
index 8bc2090a..41d85c06 100644
--- a/components/trace/trace_online.c
+++ b/components/trace/trace_online.c
@@ -32,12 +32,6 @@
 #include "los_trace_pri.h"
 #include "trace_pipeline.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 #if (LOSCFG_RECORDER_MODE_ONLINE == 1)
 UINT32 OsTraceGetMaskTid(UINT32 taskId)
 {
@@ -105,9 +99,3 @@ OfflineHead *OsTraceRecordGet(VOID)
 }
 
 #endif /* LOSCFG_RECORDER_MODE_ONLINE == 1 */
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
diff --git a/kernel/src/los_sched.c b/kernel/src/los_sched.c
index 25ffe9d8..917d6903 100644
--- a/kernel/src/los_sched.c
+++ b/kernel/src/los_sched.c
@@ -42,12 +42,6 @@
 #include "los_debugtools.h"
 #endif
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 #define OS_PRIORITY_QUEUE_NUM      32
 #define PRIQUEUE_PRIOR0_BIT        0x80000000U
 #define OS_TICK_RESPONSE_TIME_MAX  LOSCFG_BASE_CORE_TICK_RESPONSE_MAX
@@ -628,9 +622,3 @@ VOID LOS_Schedule(VOID)
         ArchTaskSchedule();
     }
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
diff --git a/kernel/src/los_sortlink.c b/kernel/src/los_sortlink.c
index afb6830b..c3cf3d3e 100644
--- a/kernel/src/los_sortlink.c
+++ b/kernel/src/los_sortlink.c
@@ -33,12 +33,6 @@
 #include "los_sched.h"
 #include "los_debug.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif
-#endif /* __cplusplus */
-
 SortLinkAttribute g_taskSortLink;
 
 #if (LOSCFG_BASE_CORE_SWTMR == 1)
@@ -175,9 +169,3 @@ UINT64 OsSortLinkGetNextExpireTime(const SortLinkAttribute *sortLinkHead)
     SortLinkList *listSorted = LOS_DL_LIST_ENTRY(head->pstNext, SortLinkList, sortLinkNode);
     return OsSortLinkGetTargetExpireTime(OsGetCurrSchedTimeCycle(), listSorted);
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif
-#endif /* __cplusplus */
diff --git a/testsuites/sample/kernel/atomic/it_los_atomic.c b/testsuites/sample/kernel/atomic/it_los_atomic.c
index b338c5b5..c5387d1b 100644
--- a/testsuites/sample/kernel/atomic/it_los_atomic.c
+++ b/testsuites/sample/kernel/atomic/it_los_atomic.c
@@ -32,12 +32,6 @@
 
 #include "it_los_atomic.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 Atomic g_testAtomicID03 = 0;
 Atomic64 g_testAtomicID05 = 0;
 
@@ -55,9 +49,3 @@ VOID ItSuiteLosAtomic(VOID)
     ItLosAtomic010();
     ItLosAtomic011();
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
diff --git a/testsuites/sample/kernel/atomic/it_los_atomic_001.c b/testsuites/sample/kernel/atomic/it_los_atomic_001.c
index fbc8c1be..7a0091da 100644
--- a/testsuites/sample/kernel/atomic/it_los_atomic_001.c
+++ b/testsuites/sample/kernel/atomic/it_los_atomic_001.c
@@ -32,12 +32,6 @@
 
 #include "it_los_atomic.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 static UINT32 TestCase(VOID)
 {
     volatile INT32 value = 0;
@@ -100,9 +94,3 @@ VOID ItLosAtomic001(VOID)
 {
     TEST_ADD_CASE("ItLosAtomic001", TestCase, TEST_LOS, TEST_ATO, TEST_LEVEL0, TEST_FUNCTION);
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
diff --git a/testsuites/sample/kernel/atomic/it_los_atomic_002.c b/testsuites/sample/kernel/atomic/it_los_atomic_002.c
index 21d162d8..944c62e9 100644
--- a/testsuites/sample/kernel/atomic/it_los_atomic_002.c
+++ b/testsuites/sample/kernel/atomic/it_los_atomic_002.c
@@ -32,12 +32,6 @@
 
 #include "it_los_atomic.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 static UINT32 TestCase(VOID)
 {
     volatile INT32 value = 0;
@@ -92,9 +86,3 @@ VOID ItLosAtomic002(VOID)
 {
     TEST_ADD_CASE("ItLosAtomic002", TestCase, TEST_LOS, TEST_ATO, TEST_LEVEL0, TEST_FUNCTION);
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
diff --git a/testsuites/sample/kernel/atomic/it_los_atomic_003.c b/testsuites/sample/kernel/atomic/it_los_atomic_003.c
index f79deece..61216f65 100644
--- a/testsuites/sample/kernel/atomic/it_los_atomic_003.c
+++ b/testsuites/sample/kernel/atomic/it_los_atomic_003.c
@@ -32,12 +32,6 @@
 
 #include "it_los_atomic.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 static UINT32 TestCase(VOID)
 {
     volatile INT32 value = 0;
@@ -106,9 +100,3 @@ VOID ItLosAtomic003(VOID)
 {
     TEST_ADD_CASE("ItLosAtomic003", TestCase, TEST_LOS, TEST_ATO, TEST_LEVEL0, TEST_FUNCTION);
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
diff --git a/testsuites/sample/kernel/atomic/it_los_atomic_004.c b/testsuites/sample/kernel/atomic/it_los_atomic_004.c
index 73e915b2..fdd7ae6e 100644
--- a/testsuites/sample/kernel/atomic/it_los_atomic_004.c
+++ b/testsuites/sample/kernel/atomic/it_los_atomic_004.c
@@ -32,12 +32,6 @@
 
 #include "it_los_atomic.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 static VOID TaskF01(VOID)
 {
     INT32 i;
@@ -104,9 +98,3 @@ VOID ItLosAtomic004(VOID)
 {
     TEST_ADD_CASE("ItLosAtomic004", TestCase, TEST_LOS, TEST_ATO, TEST_LEVEL0, TEST_FUNCTION);
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
diff --git a/testsuites/sample/kernel/atomic/it_los_atomic_005.c b/testsuites/sample/kernel/atomic/it_los_atomic_005.c
index f00a1e50..891375d9 100644
--- a/testsuites/sample/kernel/atomic/it_los_atomic_005.c
+++ b/testsuites/sample/kernel/atomic/it_los_atomic_005.c
@@ -32,12 +32,6 @@
 
 #include "it_los_atomic.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 static UINT32 TestCase(VOID)
 {
     volatile INT64 value = 0;
@@ -102,9 +96,3 @@ VOID ItLosAtomic005(VOID)
 {
     TEST_ADD_CASE("ItLosAtomic005", TestCase, TEST_LOS, TEST_ATO, TEST_LEVEL0, TEST_FUNCTION);
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
diff --git a/testsuites/sample/kernel/atomic/it_los_atomic_006.c b/testsuites/sample/kernel/atomic/it_los_atomic_006.c
index 8870c3f3..5e7d5f82 100644
--- a/testsuites/sample/kernel/atomic/it_los_atomic_006.c
+++ b/testsuites/sample/kernel/atomic/it_los_atomic_006.c
@@ -32,12 +32,6 @@
 
 #include "it_los_atomic.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 static UINT32 TestCase(VOID)
 {
     volatile INT64 value = 0;
@@ -126,9 +120,3 @@ VOID ItLosAtomic006(VOID)
 {
     TEST_ADD_CASE("ItLosAtomic006", TestCase, TEST_LOS, TEST_ATO, TEST_LEVEL0, TEST_FUNCTION);
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
\ No newline at end of file
diff --git a/testsuites/sample/kernel/atomic/it_los_atomic_007.c b/testsuites/sample/kernel/atomic/it_los_atomic_007.c
index 05f9f62a..24ffd2a7 100644
--- a/testsuites/sample/kernel/atomic/it_los_atomic_007.c
+++ b/testsuites/sample/kernel/atomic/it_los_atomic_007.c
@@ -32,12 +32,6 @@
 
 #include "it_los_atomic.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 static VOID TaskF01(VOID)
 {
     INT64 i;
@@ -110,9 +104,3 @@ VOID ItLosAtomic007(VOID)
 {
     TEST_ADD_CASE("ItLosAtomic007", TestCase, TEST_LOS, TEST_ATO, TEST_LEVEL0, TEST_FUNCTION);
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
\ No newline at end of file
diff --git a/testsuites/sample/kernel/atomic/it_los_atomic_008.c b/testsuites/sample/kernel/atomic/it_los_atomic_008.c
index 02c4b291..ff463d94 100644
--- a/testsuites/sample/kernel/atomic/it_los_atomic_008.c
+++ b/testsuites/sample/kernel/atomic/it_los_atomic_008.c
@@ -32,12 +32,6 @@
 
 #include "it_los_atomic.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 static VOID TaskF01(VOID)
 {
     INT64 i;
@@ -113,9 +107,3 @@ VOID ItLosAtomic008(VOID)
 {
     TEST_ADD_CASE("ItLosAtomic008", TestCase, TEST_LOS, TEST_ATO, TEST_LEVEL0, TEST_FUNCTION);
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
\ No newline at end of file
diff --git a/testsuites/sample/kernel/atomic/it_los_atomic_009.c b/testsuites/sample/kernel/atomic/it_los_atomic_009.c
index d578fb9b..01620e2e 100644
--- a/testsuites/sample/kernel/atomic/it_los_atomic_009.c
+++ b/testsuites/sample/kernel/atomic/it_los_atomic_009.c
@@ -32,12 +32,6 @@
 
 #include "it_los_atomic.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 #define DB_ATOMIC_MUTI_TASK_NUM (ATOMIC_MUTI_TASK_NUM * 2) // 2 is coefficients
 
 static VOID TaskF01(VOID)
@@ -132,9 +126,3 @@ VOID ItLosAtomic009(VOID)
 {
     TEST_ADD_CASE("ItLosAtomic009", TestCase, TEST_LOS, TEST_ATO, TEST_LEVEL0, TEST_FUNCTION);
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
\ No newline at end of file
diff --git a/testsuites/sample/kernel/atomic/it_los_atomic_010.c b/testsuites/sample/kernel/atomic/it_los_atomic_010.c
index 563c9902..ea485481 100644
--- a/testsuites/sample/kernel/atomic/it_los_atomic_010.c
+++ b/testsuites/sample/kernel/atomic/it_los_atomic_010.c
@@ -32,12 +32,6 @@
 
 #include "it_los_atomic.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 #define TEST_LOOP 10
 
 static VOID TaskF01(VOID)
@@ -78,10 +72,3 @@ VOID ItLosAtomic010(VOID)
 {
     TEST_ADD_CASE("ItLosAtomic010", TestCase, TEST_LOS, TEST_ATO, TEST_LEVEL0, TEST_FUNCTION);
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
diff --git a/testsuites/sample/kernel/atomic/it_los_atomic_011.c b/testsuites/sample/kernel/atomic/it_los_atomic_011.c
index 24854c48..70ebdbd6 100644
--- a/testsuites/sample/kernel/atomic/it_los_atomic_011.c
+++ b/testsuites/sample/kernel/atomic/it_los_atomic_011.c
@@ -32,12 +32,6 @@
 
 #include "it_los_atomic.h"
 
-#ifdef __cplusplus
-#if __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-
 static VOID TaskF01(VOID)
 {
     Atomic atomicTestCounter = 0;
@@ -247,10 +241,3 @@ VOID ItLosAtomic011(VOID)
 {
     TEST_ADD_CASE("ItLosAtomic011", TestCase, TEST_LOS, TEST_ATO, TEST_LEVEL0, TEST_FUNCTION);
 }
-
-#ifdef __cplusplus
-#if __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* __cplusplus */
-