diff --git a/aw/cxx/distributed/distributed_agent.cpp b/aw/cxx/distributed/distributed_agent.cpp
index a8d5a5e38f80ddc568018331e582a06a1e651fd4..77be4b57c84c9ae328d165dcea39f7b0359e0623 100644
--- a/aw/cxx/distributed/distributed_agent.cpp
+++ b/aw/cxx/distributed/distributed_agent.cpp
@@ -147,7 +147,10 @@ int DistributedAgent::DoCmdServer(int serverSockFd)
     HiLog::Info(DistributedAgent::LABEL, "accept testcase runner IP:%s port:%d \n",
                 inet_ntoa(clientAddr.sin_addr), clientAddr.sin_port);
     while (mbStop_ != true) {
-        memset_s(buff, MAX_BUFF_LEN, 0, MAX_BUFF_LEN);
+        ret = memset_s(buff, sizeof(buff), 0, MAX_BUFF_LEN);
+        if (ret != EOK) {
+            return -1;
+        }
         // every cmd length less than MAX_BUFF_LEN bytes;
         int cmdLen = recv(clientSockFd_, buff, DST_COMMAND_HEAD_LEN, 0);
         if (static_cast<unsigned long>(cmdLen) <  DST_COMMAND_HEAD_LEN) {
@@ -190,7 +193,10 @@ int DistributedAgent::DoCmdServer(int serverSockFd)
                     }
                     pszEValue[eValueLen] = '\0';
                     int nresult = OnProcessCmd(pAlignmentCmd, cmdLen, pszEValue, eValueLen);
-                    (void)memset_s(returnValue, MAX_BUFF_LEN, 0, MAX_BUFF_LEN);
+                    ret = memset_s(returnValue, sizeof(returnValue), 0, MAX_BUFF_LEN);
+                    if (ret != EOK) {
+                        return -1;
+                    }
                     auto pclinereturn = reinterpret_cast<DistributedMsg *>(returnValue);
                     pclinereturn->no = pcline->no;
                     pclinereturn->cmdTestType = htons(DST_COMMAND_CALL);
@@ -206,7 +212,10 @@ int DistributedAgent::DoCmdServer(int serverSockFd)
                 }
                 case DST_COMMAND_MSG: {
                     int nresult = 0;
-                    (void)memset_s(returnValue, MAX_BUFF_LEN, 0, MAX_BUFF_LEN);
+                    ret = memset_s(returnValue, sizeof(returnValue), 0, MAX_BUFF_LEN);
+                    if (ret != EOK) {
+                        return -1;
+                    }
                     auto pclinereturn = reinterpret_cast<DistributedMsg *>(returnValue);
                     pclinereturn->no = pcline->no;
                     pclinereturn->cmdTestType = htons(DST_COMMAND_MSG);
@@ -246,7 +255,10 @@ void DistributedAgent::OnNotifyImf(DistributedMsg *pcline)
     char alignmentCmd[DistributedAgent::CMD_LENGTH];
     char szMsg[MAX_BUFF_LEN / DistributedAgent::HALF_NUM - DistributedAgent::CMD_LENGTH];
     int cmdNo = 0;
-    (void)memset_s(alignmentCmd, DistributedAgent::CMD_LENGTH, 0, DistributedAgent::CMD_LENGTH);
+    ret = memset_s(alignmentCmd, sizeof(alignmentCmd), 0, DistributedAgent::CMD_LENGTH);
+    if (ret != EOK) {
+        return;
+    }
     (void)memset_s(szMsg,
         MAX_BUFF_LEN / DistributedAgent::HALF_NUM - DistributedAgent::CMD_LENGTH, 0,
         MAX_BUFF_LEN / DistributedAgent::HALF_NUM - DistributedAgent::CMD_LENGTH);
@@ -259,7 +271,7 @@ void DistributedAgent::OnNotifyImf(DistributedMsg *pcline)
         HiLog::Error(DistributedAgent::LABEL, "error command.\n");
     }  else {
         errno_t ret = EOK;
-        ret = memcpy_s(alignmentCmd, DistributedAgent::CMD_LENGTH, pcline->alignmentCmd, cmdNo);
+        ret = memcpy_s(alignmentCmd, sizeof(alignmentCmd), pcline->alignmentCmd, cmdNo);
         if (ret != EOK) {
             return;
         }
@@ -311,7 +323,10 @@ int DistributedAgent::OnProcessCmd(const std::string &strCommand, int cmdLen,
     char szArgs[MAX_BUFF_LEN / DistributedAgent::HALF_NUM - DistributedAgent::CMD_LENGTH];
     int cmdNo = 0;
 
-    (void)memset_s(alignmentCmd, DistributedAgent::CMD_LENGTH, 0, DistributedAgent::CMD_LENGTH);
+    ret = memset_s(alignmentCmd, sizeof(alignmentCmd), 0, DistributedAgent::CMD_LENGTH);
+    if (ret != EOK) {
+        return -1;
+    }
     (void)memset_s(szArgs,
         MAX_BUFF_LEN / DistributedAgent::HALF_NUM - DistributedAgent::CMD_LENGTH, 0,
         MAX_BUFF_LEN / DistributedAgent::HALF_NUM - DistributedAgent::CMD_LENGTH);
@@ -327,7 +342,7 @@ int DistributedAgent::OnProcessCmd(const std::string &strCommand, int cmdLen,
     }
 
     errno_t ret = EOK;
-    ret = memcpy_s(alignmentCmd, DistributedAgent::CMD_LENGTH, strCommand.c_str(), cmdNo);
+    ret = memcpy_s(alignmentCmd, sizeof(alignmentCmd), strCommand.c_str(), cmdNo);
     if (ret != EOK) {
         return -1;
     }
diff --git a/aw/cxx/distributed/distributed_major.cpp b/aw/cxx/distributed/distributed_major.cpp
index 87a243e9c16dbdfc1baba632d892b07d7ed51a4a..5747861cc33620ff2572d29ca75b38de5fefb6eb 100644
--- a/aw/cxx/distributed/distributed_major.cpp
+++ b/aw/cxx/distributed/distributed_major.cpp
@@ -251,8 +251,10 @@ bool DistributeTestEnvironment::RunTestCmd(size_t devNo, const std::string &strC
     bool breturn = false;
     size_t lenptr = 0;
     errno_t ret = EOK;
-    (void)memset_s(szbuf, MAX_BUFF_LEN, 0, MAX_BUFF_LEN);
-
+    ret = memset_s(szbuf, sizeof(szbuf), 0, MAX_BUFF_LEN);
+    if (ret != EOK) {
+        return breturn;
+    }
     // add 2 '\0'
     size_t rlen = cmdLen + expectValueLen + DST_COMMAND_HEAD_LEN + sizeof(int)*HALF_BUF_LEN + HALF_BUF_LEN;
     if (rlen <= MAX_BUFF_LEN) {
diff --git a/examples/calculator/src/calculator.cpp b/examples/calculator/src/calculator.cpp
index 9b504d69bae9bb8e4aae2a9989089e473f4c8d5c..d4447604658e3c9a8ccacfc5e0bc61ace95985e3 100644
--- a/examples/calculator/src/calculator.cpp
+++ b/examples/calculator/src/calculator.cpp
@@ -33,7 +33,10 @@ int Sub(int e1, int e2)
 int Mul(int e1, int e2)
 {
     int result = e1 * e2;
-    if (!e1 || (result / e1) != e2) {
+    if (e1 == 0) {
+        return -1;
+    }
+    if ((result / e1) != e2) {
         result = -1;
     }
     return result;
diff --git a/examples/distributedb/test/distributedtest/common/distribute_demo_agent.cpp b/examples/distributedb/test/distributedtest/common/distribute_demo_agent.cpp
index 95dab2bc559b84e81ae266e7a1548826e1161287..b58239eed41e18bb8aaad743cde2eec0101a7be0 100644
--- a/examples/distributedb/test/distributedtest/common/distribute_demo_agent.cpp
+++ b/examples/distributedb/test/distributedtest/common/distribute_demo_agent.cpp
@@ -186,8 +186,16 @@ int DistributeDemoAgent::AddTwoValue(const std::string &strArgs, int argsLen, co
     int val1 = 0;
     int val2 = 0;
     int val3 = 0;
-    sscanf_s(strArgs.c_str(), "%d %d", &val1, &val2);
-    sscanf_s(strExpectValue.c_str(), "%d", &val3);
+    ret1 = sscanf_s(strArgs.c_str(), "%d %d", &val1, &val2);
+    if (ret1 == -1) {
+        HiLog::Error(LABEL, "sccanf_s failed. ret1 == -1.");
+        return 0;
+    }
+    ret2 = sscanf_s(strExpectValue.c_str(), "%d", &val3);
+    if (ret2 == -1) {
+        HiLog::Error(LABEL, "sccanf_s failed. ret2 == -1.");
+        return 0;
+    }
     EXPECT_TRUE(val3 == (val1 + val2));
     return val1 + val2;
 }