diff --git a/be/src/vec/functions/function_date_or_datetime_computation.h b/be/src/vec/functions/function_date_or_datetime_computation.h
index 383fb10e34ad1d..bb1b6b9d89c069 100644
--- a/be/src/vec/functions/function_date_or_datetime_computation.h
+++ b/be/src/vec/functions/function_date_or_datetime_computation.h
@@ -295,7 +295,13 @@ struct TimeDiffImpl {
         const auto& ts1 = reinterpret_cast<const DateValueType2&>(t1);
         is_null = !ts0.is_valid_date() || !ts1.is_valid_date();
         if constexpr (UsingTimev2) {
-            return ts0.microsecond_diff(ts1);
+            // refer to https://dev.mysql.com/doc/refman/5.7/en/time.html
+            // the time type value between '-838:59:59' and '838:59:59', so the return value should limited
+            int64_t diff_m = ts0.microsecond_diff(ts1);
+            if (diff_m > (int64_t)3020399 * 1000 * 1000) {
+                diff_m = (int64_t)3020399 * 1000 * 1000;
+            }
+            return (double)diff_m;
         } else {
             return (1000 * 1000) * ts0.second_diff(ts1);
         }
diff --git a/be/src/vec/runtime/vdatetime_value.h b/be/src/vec/runtime/vdatetime_value.h
index 7b138b2bc3a1f1..54dc368f620f22 100644
--- a/be/src/vec/runtime/vdatetime_value.h
+++ b/be/src/vec/runtime/vdatetime_value.h
@@ -1119,13 +1119,13 @@ class DateV2Value {
         return (daynr() - rhs.daynr()) * SECOND_PER_HOUR * HOUR_PER_DAY + time_part_diff(rhs);
     }
 
+    // used by INT microseconds_diff(DATETIME enddate, DATETIME startdate)
+    // return it's int type, so shouldn't have any limit.
+    // when used by TIME TIMEDIFF(DATETIME expr1, DATETIME expr2), it's return time type, should have limited.
     template <typename RHS>
-    double microsecond_diff(const RHS& rhs) const {
+    int64_t microsecond_diff(const RHS& rhs) const {
         int64_t diff_m = (daynr() - rhs.daynr()) * SECOND_PER_HOUR * HOUR_PER_DAY * 1000 * 1000 +
                          time_part_diff_microsecond(rhs);
-        if (diff_m > (int64_t)3020399 * 1000 * 1000) {
-            diff_m = (int64_t)3020399 * 1000 * 1000;
-        }
         return diff_m;
     }
 
diff --git a/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java b/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
index 67f3569091418a..d55f27a26ccbe7 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
@@ -1802,12 +1802,6 @@ public void initFuzzyModeVariables() {
                 default:
                     break;
             }
-            randomInt = random.nextInt(2);
-            if (randomInt % 2 == 0) {
-                this.enableFoldConstantByBe = false;
-            } else {
-                this.enableFoldConstantByBe = true;
-            }
 
             switch (Config.pull_request_id % 3) {
                 case 0:
@@ -1845,8 +1839,10 @@ public void initFuzzyModeVariables() {
             if (Config.pull_request_id > 0) {
                 if (Config.pull_request_id % 2 == 1) {
                     this.batchSize = 4064;
+                    // this.enableFoldConstantByBe = true;
                 } else {
                     this.batchSize = 50;
+                    // this.enableFoldConstantByBe = false;
                 }
             }
         }
diff --git a/regression-test/data/query_p0/sql_functions/datetime_functions/test_time_diff.out b/regression-test/data/query_p0/sql_functions/datetime_functions/test_time_diff.out
index b8944f41df2eff..d9cd4c270a138d 100644
--- a/regression-test/data/query_p0/sql_functions/datetime_functions/test_time_diff.out
+++ b/regression-test/data/query_p0/sql_functions/datetime_functions/test_time_diff.out
@@ -18,8 +18,8 @@
 63113904000
 
 -- !sql --
-3020399000
+2176243380000
 
 -- !sql --
-3020399000000
+2176243380000000