diff --git a/src/share/object/ob_obj_cast.cpp b/src/share/object/ob_obj_cast.cpp
index 471a8e50e9677cbc49cfc89da3344ceca7f2e49c..8baf4384bafc8dffb4211bae23a46445b3697e64 100644
--- a/src/share/object/ob_obj_cast.cpp
+++ b/src/share/object/ob_obj_cast.cpp
@@ -598,13 +598,11 @@ int real_range_check_only(const ObAccuracy &accuracy, Type value)
   if (OB_LIKELY(precision > 0) &&
       OB_LIKELY(scale >= 0) &&
       OB_LIKELY(precision >= scale)) {
-    // Because double type represents a larger width, use double type instead of float to check
-    // result range.
-    double integer_part = static_cast<double>(pow(10.0, static_cast<double>(precision - scale)));
-    double decimal_part = static_cast<double>(pow(10.0, static_cast<double>(scale)));
-    double max_value = integer_part - 1 / decimal_part;
-    double min_value = -max_value;
-    if (OB_FAIL(numeric_range_check(static_cast<double>(value), min_value, max_value, value))) {
+    Type integer_part = static_cast<Type>(pow(10.0, static_cast<double>(precision - scale)));
+    Type decimal_part = static_cast<Type>(pow(10.0, static_cast<double>(scale)));
+    Type max_value = integer_part - 1 / decimal_part;
+    Type min_value = -max_value;
+    if (OB_FAIL(numeric_range_check(value, min_value, max_value, value))) {
     }
   }
   return ret;
diff --git a/src/share/object/ob_obj_cast_util.h b/src/share/object/ob_obj_cast_util.h
index 2014fd429dede0f02afd28c94b9ed09a9e5059fc..503337d8f0a41793c0c0a059993e4f2c7d9b2250 100644
--- a/src/share/object/ob_obj_cast_util.h
+++ b/src/share/object/ob_obj_cast_util.h
@@ -84,27 +84,6 @@ OB_INLINE int numeric_range_check<double, float>(const double in_val,
   return ret;
 }
 
-// check range using double type
-OB_INLINE int numeric_range_check(const double in_val,
-                                  const double min_out_val,
-                                  const double max_out_val,
-                                  float &out_val)
-{
-  int ret = OB_SUCCESS;
-  if (isinf(in_val)) {
-    out_val = static_cast<float>(in_val);
-  } else {
-    if (in_val < min_out_val) {
-      ret = OB_DATA_OUT_OF_RANGE;
-      out_val = static_cast<float>(min_out_val);
-    } else if (in_val > max_out_val) {
-      ret = OB_DATA_OUT_OF_RANGE;
-      out_val = static_cast<float>(max_out_val);
-    }
-  }
-  return ret;
-}
-
 // check if is negative only.
 template <typename OutType>
 OB_INLINE int numeric_negative_check(OutType &out_val)
@@ -191,13 +170,11 @@ int real_range_check(const ObAccuracy &accuracy, Type &value)
   if (OB_LIKELY(precision > 0) &&
       OB_LIKELY(scale >= 0) &&
       OB_LIKELY(precision >= scale)) {
-    // Because double type represents a larger width, use double type instead of float to check
-    // result range.
-    double integer_part = static_cast<double>(pow(10.0, static_cast<double>(precision - scale)));
-    double decimal_part = static_cast<double>(pow(10.0, static_cast<double>(scale)));
-    double max_value = static_cast<double>(integer_part - 1 / decimal_part);
-    double min_value = static_cast<double>(-max_value);
-    if (OB_FAIL(numeric_range_check(static_cast<double>(value), min_value, max_value, value))) {
+    Type integer_part = static_cast<Type>(pow(10.0, static_cast<double>(precision - scale)));
+    Type decimal_part = static_cast<Type>(pow(10.0, static_cast<double>(scale)));
+    Type max_value = static_cast<Type>(integer_part - 1 / decimal_part);
+    Type min_value = static_cast<Type>(-max_value);
+    if (OB_FAIL(numeric_range_check(value, min_value, max_value, value))) {
     } else {
       value = static_cast<Type>(rint((value - 
                                       floor(static_cast<double>(value)))* decimal_part) / 
diff --git a/src/sql/engine/expr/ob_datum_cast.cpp b/src/sql/engine/expr/ob_datum_cast.cpp
index f4d9c60626b804e88eafba03199c747168ac0ad6..dcb49f8a8ef5bd81e2832966147cbcb3f9c19c14 100644
--- a/src/sql/engine/expr/ob_datum_cast.cpp
+++ b/src/sql/engine/expr/ob_datum_cast.cpp
@@ -1092,8 +1092,20 @@ static OB_INLINE int common_double_float(const ObExpr &expr,
   ObObjType out_type = expr.datum_meta_.type_;
   // oracle support float/double infiniy, no need to verify data overflow.
   // C language would cast value to infinity, which is correct behavor in oracle mode
-  if (lib::is_mysql_mode() && CAST_FAIL(real_range_check(out_type, in_val, out_val))) {
-    LOG_WARN("real_range_check failed", K(ret), K(in_val));
+  if (lib::is_mysql_mode()) {
+    double truncated_val = in_val;
+    if (ob_is_float_tc(out_type) && CM_IS_COLUMN_CONVERT(expr.extra_)) {
+      // truncate float value if its ps information is fixed.
+      ObAccuracy accuracy(expr.datum_meta_.precision_, expr.datum_meta_.scale_);
+      if (CAST_FAIL(real_range_check(accuracy, truncated_val))) {
+        LOG_WARN("fail to real range check", K(ret));
+      } else {
+        out_val = static_cast<float>(truncated_val);
+      }
+    }
+    if (OB_SUCC(ret) && CAST_FAIL(real_range_check(out_type, truncated_val, out_val))) {
+      LOG_WARN("real_range_check failed", K(ret), K(in_val));
+    }
   }
   return ret;
 }