diff --git a/components/utilities/ymodem/ry_sy.c b/components/utilities/ymodem/ry_sy.c
index b77bd7abc2451d053ad8cdde7d544cb7d846a3e8..d61b0cde588f61b94288c0d0ad40a37a47af3836 100644
--- a/components/utilities/ymodem/ry_sy.c
+++ b/components/utilities/ymodem/ry_sy.c
@@ -15,8 +15,6 @@
 #include <unistd.h>
 #include <sys/stat.h>
 #include <sys/statfs.h>
-
-#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -115,7 +113,7 @@ static enum rym_code _rym_send_begin(
         rt_kprintf("error open file.\n");
         return RYM_ERR_FILE;
     }
-    sprintf((char *)buf, "%s%c%ld", (char *) & (cctx->fpath[1]), insert_0, file_buf.st_size);
+    rt_sprintf((char *)buf, "%s%c%d", (char *) & (cctx->fpath[1]), insert_0, file_buf.st_size);
 
     return RYM_CODE_SOH;
 }
@@ -140,8 +138,7 @@ static enum rym_code _rym_send_data(
     if (read_size < len)
     {
         rt_memset(buf + read_size, 0x1A, len - read_size);
-        /* stage = RYM_STAGE_FINISHING */
-        ctx->stage = 4;
+        ctx->stage = RYM_STAGE_FINISHING;
     }
 
     return RYM_CODE_SOH;
diff --git a/components/utilities/ymodem/ymodem.h b/components/utilities/ymodem/ymodem.h
index 7006cf268d6abb4ab995984d15180d914af80ffb..2f05e4f2f21390c754e0cf9d315f8f8eefa1a65a 100644
--- a/components/utilities/ymodem/ymodem.h
+++ b/components/utilities/ymodem/ymodem.h
@@ -72,7 +72,7 @@ enum rym_code
 
 enum rym_stage
 {
-    RYM_STAGE_NONE,
+    RYM_STAGE_NONE = 0,
     /* set when C is send */
     RYM_STAGE_ESTABLISHING,
     /* set when we've got the packet 0 and sent ACK and second C */