diff --git a/cplusplus/level1_single_api/7_dvpp/vdec_sample/src/Vdec.cpp b/cplusplus/level1_single_api/7_dvpp/vdec_sample/src/Vdec.cpp
index 3c6326be3b3ab693dee7071a8b4e0b03458698ce..5a447b14d27e4752dfb39082389a03a8d5b975f0 100644
--- a/cplusplus/level1_single_api/7_dvpp/vdec_sample/src/Vdec.cpp
+++ b/cplusplus/level1_single_api/7_dvpp/vdec_sample/src/Vdec.cpp
@@ -1191,8 +1191,8 @@ int32_t check_option()
             __FUNCTION__, __LINE__, g_is_write_file);
         return HI_FAILURE;
     }
-    // Check channel number[1, 96]
-    if ((g_chn_num > 96) || (g_chn_num < 1)) {
+    // Check channel number > 0
+    if (g_chn_num < 1) {
         printf("[%s][%d] chan num is invalid, chan num = %u \n", __FUNCTION__, __LINE__, g_chn_num);
         return HI_FAILURE;
     }
@@ -1213,7 +1213,7 @@ int32_t check_option()
         return HI_FAILURE;
     }
     // Check channel start number
-    if (g_start_chn_num + g_chn_num >= VDEC_MAX_CHN_NUM) {
+    if (g_start_chn_num + g_chn_num > VDEC_MAX_CHN_NUM) {
         printf("[%s][%d] start chan num is invalid, start chan num = %u \n", __FUNCTION__, __LINE__, g_start_chn_num);
         return HI_FAILURE;
     }