diff --git a/jsonparse/web_cmd_parse.cpp b/jsonparse/web_cmd_parse.cpp
index 711ea8a..e59b47d 100644
--- a/jsonparse/web_cmd_parse.cpp
+++ b/jsonparse/web_cmd_parse.cpp
@@ -77,9 +77,19 @@ std::string JsonData::JsonCmd_Cgi_02(Param_02 &param) {
     if (0 == param.mMode) {
         jsonVal["type"] = "SET";
         if (param.mMode == 0) { //本地校时
-            SetTime((unsigned long)param.mTimeStamp);
-            mssleep(200);
-            system("hwclock -w");
+            unsigned long set_timestamp = (unsigned long)param.mTimeStamp;
+            char localtimestamp[32] = {0};
+            GetTimeNet(localtimestamp, 1);
+            std::string current_system_timestamp = std::string(localtimestamp);
+            unsigned long current_timestamp = boost::lexical_cast<unsigned long>(current_system_timestamp);
+            unsigned long diff_seconds = abs(current_timestamp - set_timestamp);
+            if (diff_seconds > 5) {
+                SetTime((unsigned long)param.mTimeStamp);
+                mssleep(200);
+                system("hwclock -w");
+            } else {
+                zlog_warn(zct, "diff seconds:%ld lesser than 5, not to modify", diff_seconds);
+            }
         } else if (param.mMode == 1) { //与服务器校时
             char buf[256] = {0};
             sprintf(buf, "{\"dataNodeGatewayNo\":\"%s\",\"cmd\":\"12\",\"status\":\"REQ\"}", GlobalConfig::MacAddr_G.c_str());