diff --git a/source/libs/parser/src/parTranslater.c b/source/libs/parser/src/parTranslater.c
index 85d9ddde85..7a2a73d013 100755
--- a/source/libs/parser/src/parTranslater.c
+++ b/source/libs/parser/src/parTranslater.c
@@ -5401,7 +5401,7 @@ static int32_t translateFill(STranslateContext* pCxt, SSelectStmt* pSelect, SInt
   return checkFill(pCxt, (SFillNode*)pInterval->pFill, (SValueNode*)pInterval->pInterval, false);
 }
 
-static int32_t getMonthsFromTimeVal(int64_t val, int32_t fromPrecision, char unit, int64_t* pMonth) {
+static int32_t getMonthsFromTimeVal(int64_t val, int32_t fromPrecision, char unit, double* pMonth) {
   int64_t days = -1;
   int32_t code = convertTimeFromPrecisionToUnit(val, fromPrecision, 'd', &days);
   if (TSDB_CODE_SUCCESS != code) {
@@ -5416,7 +5416,7 @@ static int32_t getMonthsFromTimeVal(int64_t val, int32_t fromPrecision, char uni
     case 'h':
     case 'd':
     case 'w':
-      *pMonth = days / 28;
+      *pMonth = days / 28.0;
       return code;
     case 'n':
       *pMonth = val;
@@ -5499,7 +5499,7 @@ static int32_t checkIntervalWindow(STranslateContext* pCxt, SIntervalWindowNode*
       return generateSyntaxErrMsg(&pCxt->msgBuf, TSDB_CODE_PAR_INTER_OFFSET_TOO_BIG);
     }
     if (!fixed) {
-      int64_t offsetMonth = 0, intervalMonth = 0;
+      double offsetMonth = 0, intervalMonth = 0;
       int32_t code = getMonthsFromTimeVal(pOffset->datum.i, precision, pOffset->unit, &offsetMonth);
       if (TSDB_CODE_SUCCESS != code) {
           return code;
@@ -5530,7 +5530,21 @@ static int32_t checkIntervalWindow(STranslateContext* pCxt, SIntervalWindowNode*
         (pInter->datum.i / pSliding->datum.i > INTERVAL_SLIDING_FACTOR)) {
       return generateSyntaxErrMsg(&pCxt->msgBuf, TSDB_CODE_PAR_INTER_SLIDING_TOO_SMALL);
     }
-    if (pSliding->datum.i > pInter->datum.i) {
+    if (valInter) {
+      double slidingMonth = 0, intervalMonth = 0;
+      int32_t code = getMonthsFromTimeVal(pSliding->datum.i, precision, pSliding->unit, &slidingMonth);
+      if (TSDB_CODE_SUCCESS != code) {
+          return code;
+      }
+      code = getMonthsFromTimeVal(pInter->datum.i, precision, pInter->unit, &intervalMonth);
+      if (TSDB_CODE_SUCCESS != code) {
+          return code;
+      }
+      if (slidingMonth > intervalMonth) {
+        return generateSyntaxErrMsg(&pCxt->msgBuf, TSDB_CODE_PAR_INTER_SLIDING_TOO_BIG);
+      }
+    }
+    if (!valInter && pSliding->datum.i > pInter->datum.i) {
       return generateSyntaxErrMsg(&pCxt->msgBuf, TSDB_CODE_PAR_INTER_SLIDING_TOO_BIG);
     }
   }
diff --git a/tests/script/tsim/query/interval.sim b/tests/script/tsim/query/interval.sim
index 7f950ea69c..bce55eda27 100644
--- a/tests/script/tsim/query/interval.sim
+++ b/tests/script/tsim/query/interval.sim
@@ -276,6 +276,10 @@ sql insert into t6 values ("2024-03-01 14:34:07.051", 66);
 
 sleep 300
 
+sql select _wstart, count(*) from stb interval(1n) sliding(1d);
+sql select _wstart, count(*) from stb interval(1n) sliding(28d);
+sql_error select _wstart, count(*) from stb interval(1n) sliding(29d);
+
 sql select _wstart, count(*) from (select * from stb partition by tbname) interval(2s);
 
 print $data00,$data01