diff --git a/APP_Framework/Applications/benchmark/support/benchmark.c b/APP_Framework/Applications/benchmark/support/benchmark.c
index 707c3e32a..9cb1a80ff 100644
--- a/APP_Framework/Applications/benchmark/support/benchmark.c
+++ b/APP_Framework/Applications/benchmark/support/benchmark.c
@@ -68,7 +68,6 @@ extern benchmark_handle *get_benchmark_list();
 extern void add_benchmark_handle(benchmark_handle *head, benchmark_handle *);
 
 float tmp_diff = 0.0;
-
 float global_diff = 0.0;
 void start_trigger(clock_t *start_time) { *start_time = PrivGetTickTime(); }
 void stop_trigger(clock_t *end_time) { *end_time = PrivGetTickTime(); }
@@ -103,6 +102,7 @@ void print_result() {
   }
 };
 
+pthread_mutex_t case_mu;
 sem_t syn_sem;
 void *run_one_example(void *arg) {
   const benchmark_handle *handle = arg;
@@ -118,7 +118,9 @@ void *run_one_example(void *arg) {
   if (!correct) {
     printf("[EmBench] Wrong result!.\n");
   }
+  PrivMutexObtain(&case_mu);
   organize_result(handle, start_time, end_time);
+  PrivMutexAbandon(&case_mu);
   PrivSemaphoreAbandon(&syn_sem);
 }
 
@@ -138,6 +140,7 @@ void *run_benchmark(void *args) {
   case_attr.schedparam.sched_priority = 30;
   case_attr.stacksize = 16384;
   PrivSemaphoreCreate(&syn_sem, 0, -21);
+  PrivMutexCreate(&case_mu, 0);
 
   benchmark_handle *cur_handle = head.next;
   while (NULL != cur_handle) {