diff --git a/include/libs/monitor/monitor.h b/include/libs/monitor/monitor.h
index 972361fd6855ae789a313746bcca1f18ce2fb533..a5372014d5b7997049813c8eb8240c4c440b4ead 100644
--- a/include/libs/monitor/monitor.h
+++ b/include/libs/monitor/monitor.h
@@ -126,10 +126,17 @@ typedef struct {
   SMonDiskDesc tempdir;
 } SMonDiskInfo;
 
+typedef enum {
+  MON_LEVEL_ERROR = 0,
+  MON_LEVEL_INFO = 1,
+  MON_LEVEL_DEBUG = 2,
+  MON_LEVEL_TRACE = 3,
+} EMonLogLevel;
+
 typedef struct {
-  int64_t ts;
-  int8_t  level;
-  char    content[MON_LOG_LEN];
+  int64_t      ts;
+  EMonLogLevel level;
+  char         content[MON_LOG_LEN];
 } SMonLogItem;
 
 typedef struct SMonInfo SMonInfo;
diff --git a/source/libs/monitor/src/monitor.c b/source/libs/monitor/src/monitor.c
index 14375a4ef6ae73cba2aa3f1e4901cc416f48a3e5..949fe3e5e7591938288e278048a1146b928d32ac 100644
--- a/source/libs/monitor/src/monitor.c
+++ b/source/libs/monitor/src/monitor.c
@@ -270,6 +270,21 @@ void monSetDiskInfo(SMonInfo *pMonitor, SMonDiskInfo *pInfo) {
   tjsonAddDoubleToObject(pTempdirJson, "total", pInfo->tempdir.size.total);
 }
 
+static const char *monLogLevelStr(EMonLogLevel level) {
+  switch (level) {
+    case MON_LEVEL_ERROR:
+      return "error";
+    case MON_LEVEL_INFO:
+      return "info";
+    case MON_LEVEL_DEBUG:
+      return "debug";
+    case MON_LEVEL_TRACE:
+      return "trace";
+    default:
+      return "undefine";
+  }
+}
+
 static void monSetLogInfo(SMonInfo *pMonitor) {
   SJson *pJson = tjsonCreateObject();
   if (pJson == NULL) return;
@@ -291,7 +306,7 @@ static void monSetLogInfo(SMonInfo *pMonitor) {
     taosFormatUtcTime(buf, sizeof(buf), pLogItem->ts, TSDB_TIME_PRECISION_MILLI);
 
     tjsonAddStringToObject(pLogJson, "ts", buf);
-    tjsonAddDoubleToObject(pLogJson, "level", pLogItem->level);
+    tjsonAddStringToObject(pLogJson, "level", monLogLevelStr(pLogItem->level));
     tjsonAddStringToObject(pLogJson, "content", pLogItem->content);
 
     if (tjsonAddItemToArray(pLogsJson, pLogJson) != 0) tjsonDelete(pLogJson);
diff --git a/source/libs/monitor/test/monTest.cpp b/source/libs/monitor/test/monTest.cpp
index ad48ed5407796f34f1ea4d14084c013a2e29e52d..49abd4803ac314acf68cabf5a06efff22e3c6d80 100644
--- a/source/libs/monitor/test/monTest.cpp
+++ b/source/libs/monitor/test/monTest.cpp
@@ -195,19 +195,19 @@ void MonitorTest::GetDiskInfo(SMonInfo *pMonitor, SMonDiskInfo *pInfo) {
 void MonitorTest::AddLogInfo1() {
   SMonLogItem log1 = {0};
   log1.ts = taosGetTimestampMs();
-  log1.level = 1;
+  log1.level = MON_LEVEL_INFO;
   strcpy(log1.content, "1 -------------------------- a");
   monAddLogItem(&log1);
 
   SMonLogItem log2 = {0};
   log2.ts = taosGetTimestampMs();
-  log2.level = 1;
+  log2.level = MON_LEVEL_ERROR;
   strcpy(log2.content, "1 ------------------------ b");
   monAddLogItem(&log2);
 
   SMonLogItem log3 = {0};
   log3.ts = taosGetTimestampMs();
-  log3.level = 1;
+  log3.level = MON_LEVEL_DEBUG;
   strcpy(log3.content, "1 ------- c");
   monAddLogItem(&log3);
 }
@@ -215,13 +215,13 @@ void MonitorTest::AddLogInfo1() {
 void MonitorTest::AddLogInfo2() {
   SMonLogItem log1;
   log1.ts = taosGetTimestampMs();
-  log1.level = 01;
+  log1.level = MON_LEVEL_ERROR;
   strcpy(log1.content, "2 ------- a");
   monAddLogItem(&log1);
 
   SMonLogItem log2;
   log2.ts = taosGetTimestampMs();
-  log2.level = 0;
+  log2.level = MON_LEVEL_ERROR;
   strcpy(log2.content, "2 ------- b");
   monAddLogItem(&log2);
 }