diff --git a/customer_app/sdk_app_dac/sdk_app_dac/dac_audio.c b/customer_app/sdk_app_dac/sdk_app_dac/dac_audio.c
index cd313b9a..422173f2 100644
--- a/customer_app/sdk_app_dac/sdk_app_dac/dac_audio.c
+++ b/customer_app/sdk_app_dac/sdk_app_dac/dac_audio.c
@@ -170,7 +170,7 @@ static void DAC_LLI_Init(uint32_t *psrc, uint32_t bufsize)
         }
         LLIList[i].dmaCtrl= dmaCtrlRegVal;
     }
-    
+
     LLIList[i - 1].nextLLI=(uint32_t)&LLIList[0];
 
 
@@ -208,12 +208,9 @@ static BL_Err_Type DAC_DMA_Test(uint32_t *psrc, uint32_t bufsize)
 }
 
 
-int audio_dac_dma_test(uint16_t *paddr, uint32_t bufsize, int sampling)
+int audio_dac_dma_test(uint16_t *paddr, uint32_t bufsize)
 {
-    sampling = sampling;
-
     if(SUCCESS != DAC_DMA_Test(paddr, bufsize)){
-
        return 0;
     }
 
diff --git a/customer_app/sdk_app_dac/sdk_app_dac/dac_audio.h b/customer_app/sdk_app_dac/sdk_app_dac/dac_audio.h
index b4efae8a..9ce19bbb 100644
--- a/customer_app/sdk_app_dac/sdk_app_dac/dac_audio.h
+++ b/customer_app/sdk_app_dac/sdk_app_dac/dac_audio.h
@@ -31,6 +31,6 @@
 #define __BL_DAC_DMA_H__
 #include <stdint.h>
 
-int audio_dac_dma_test(uint16_t *pcbuff, uint32_t bufsize, int sampling);
+int audio_dac_dma_test(uint16_t *pcbuff, uint32_t bufsize);
 
 #endif
diff --git a/customer_app/sdk_app_dac/sdk_app_dac/main.c b/customer_app/sdk_app_dac/sdk_app_dac/main.c
index 6e4be750..3b50d7b9 100755
--- a/customer_app/sdk_app_dac/sdk_app_dac/main.c
+++ b/customer_app/sdk_app_dac/sdk_app_dac/main.c
@@ -129,12 +129,11 @@ static int get_dts_addr(const char *name, uint32_t *start, uint32_t *off)
 
 static void cmd_play_audio(char *buf, int len, int argc, char **argv)
 {
-    int sampling = 0;
     int fd_audio;
     romfs_filebuf_t filebuf;
     uint16_t *p_u16addr;
     uint32_t bufsize;
-    
+
     fd_audio = aos_open("/romfs/audio_32k", 0);
 
     if (fd_audio < 0) {
@@ -144,15 +143,12 @@ static void cmd_play_audio(char *buf, int len, int argc, char **argv)
     aos_ioctl(fd_audio, IOCTL_ROMFS_GET_FILEBUF, (long unsigned int)&filebuf);
     aos_close(fd_audio);
 
-    // From a long unsigned int* to a uint16_t* should be a NOP, even 
+    // From a long unsigned int* to a uint16_t* should be a NOP, even
     // considering alignment.
     p_u16addr = (uint16_t*) filebuf.buf;
     bufsize = filebuf.bufsize;
-    
-    audio_dac_dma_test(p_u16addr, bufsize, sampling); 
-
-    return;
 
+    audio_dac_dma_test(p_u16addr, bufsize);
 }
 
 int bl_sys_play_audio_init(void)
@@ -176,7 +172,7 @@ static void aos_loop_proc(void *pvParameters)
     if (0 == get_dts_addr("uart", &fdt, &offset)) {
         vfs_uart_init(fdt, offset);
     }
-     
+
     #ifdef CONF_USER_ENABLE_VFS_ROMFS
     romfs_register();
     printf("romfs register \r\n");
@@ -194,8 +190,7 @@ static void aos_loop_proc(void *pvParameters)
         aos_poll_read_fd(fd_console, aos_cli_event_cb_read_get(), (void*)0x12345678);
         _cli_init();
     }
-    
-    
+
     aos_loop_run();
 
     puts("------------------------------------------\r\n");