diff --git a/interfaces/inner_api/syscap_interface.c b/interfaces/inner_api/syscap_interface.c
index 14082ca..512b459 100644
--- a/interfaces/inner_api/syscap_interface.c
+++ b/interfaces/inner_api/syscap_interface.c
@@ -163,6 +163,7 @@ bool EncodePrivateSyscap(char **output, int *outputLen)
     *outputLen = bufferLen - PCID_MAIN_BYTES - 1;
     if (*outputLen == 0) {
         *output = outputStr;
+        (*outputLen)--;
         return true;
     }
     outputStr = (char *)malloc(*outputLen);
@@ -246,7 +247,7 @@ bool DecodePrivateSyscap(char *input, char (**output)[SINGLE_SYSCAP_LEN], int *o
     if (input == NULL) {
         *output = outputArray;
         *outputCnt = syscapCnt;
-        return false;
+        return true;
     }
 
     while (*inputPos != '\0') {
diff --git a/src/create_pcid.c b/src/create_pcid.c
index 7926f93..ab48c8b 100644
--- a/src/create_pcid.c
+++ b/src/create_pcid.c
@@ -275,8 +275,8 @@ int32_t CreatePCID(char *inputFile, char *outDirPath)
     for (i = 0; i < privateCapSize; i++) {
         jsonArrayItem = cJSON_GetArrayItem(jsonPriSyscapObj, i);
         priSyscapStr = strchr(jsonArrayItem->valuestring, '.') + 1;
-        nRet = strcat_s(priSyscapHead, PRIVATE_SYSCAP_SIZE - 1, priSyscapStr);
-        nRet += strcat_s(priSyscapHead, PRIVATE_SYSCAP_SIZE - 1, ",");
+        nRet = strcat_s(priSyscapHead, allPriSyscapStrLen + 1, priSyscapStr);
+        nRet += strcat_s(priSyscapHead, allPriSyscapStrLen + 1, ",");
         if (nRet != EOK) {
             PRINT_ERR("strcat_s \"pri\" string is failed\n");
             ret = -1;
diff --git a/test/unittest/common/syscap_codec_test.cpp b/test/unittest/common/syscap_codec_test.cpp
index bd388ea..b2b2054 100644
--- a/test/unittest/common/syscap_codec_test.cpp
+++ b/test/unittest/common/syscap_codec_test.cpp
@@ -49,6 +49,9 @@ HWTEST_F(SyscapCodecTest, EncodePrivateSyscap, TestSize.Level1)
     char *charPriInput = nullptr;
     int priOutLen;
     EXPECT_TRUE(EncodePrivateSyscap(&charPriInput, &priOutLen));
+    // Currently, private syscap is null.
+    EXPECT_EQ(charPriInput, nullptr);
+    EXPECT_EQ(priOutLen, 0);
     free(charPriInput);
 }
 
@@ -74,7 +77,7 @@ HWTEST_F(SyscapCodecTest, DecodeOsSyscap, TestSize.Level1)
 
 /*
  * @tc.name: DecodePrivateSyscap
- * @tc.desc: Check the PrivateSyscap Decoding.
+ * @tc.desc: Check the null PrivateSyscap Decoding.
  * @tc.type: FUNC
  */
 HWTEST_F(SyscapCodecTest, DecodePrivateSyscap, TestSize.Level1)