diff --git a/src/sql/engine/expr/ob_expr_column_conv.cpp b/src/sql/engine/expr/ob_expr_column_conv.cpp
index 7f946c7ccb..6a8f77b834 100644
--- a/src/sql/engine/expr/ob_expr_column_conv.cpp
+++ b/src/sql/engine/expr/ob_expr_column_conv.cpp
@@ -285,15 +285,16 @@ int ObExprColumnConv::calc_result_typeN(ObExprResType &type,
         LOG_WARN("inconsistent datatypes", "expected", type_tc, "got", value_tc);
       } else {
         bool is_ddl = const_cast<sql::ObSQLSessionInfo *>(type_ctx.get_session())->get_ddl_info().is_ddl();
+        type_ctx.set_cast_mode(type_ctx.get_cast_mode() |
+                                  type_ctx.get_raw_expr()->get_extra() |
+                                  CM_COLUMN_CONVERT);
         if (!is_ddl) {
-          type_ctx.set_cast_mode(type_ctx.get_cast_mode() |
-                                  type_ctx.get_raw_expr()->get_extra() |
-                                  CM_COLUMN_CONVERT |
-                                  CM_CHARSET_CONVERT_IGNORE_ERR);
-        } else {
-          type_ctx.set_cast_mode(type_ctx.get_cast_mode() |
-                                  type_ctx.get_raw_expr()->get_extra() |
-                                  CM_COLUMN_CONVERT );
+          bool is_strict = is_strict_mode(type_ctx.get_session()->get_sql_mode());
+          if (lib::is_mysql_mode() && is_strict) {
+            //do nothing
+          } else {
+            type_ctx.set_cast_mode(type_ctx.get_cast_mode() | CM_CHARSET_CONVERT_IGNORE_ERR);
+          }
         }
         types[4].set_calc_meta(type);
       }
diff --git a/src/sql/resolver/expr/ob_raw_expr_util.cpp b/src/sql/resolver/expr/ob_raw_expr_util.cpp
index dc9c0fb2c0..375d25cf97 100644
--- a/src/sql/resolver/expr/ob_raw_expr_util.cpp
+++ b/src/sql/resolver/expr/ob_raw_expr_util.cpp
@@ -3776,10 +3776,15 @@ int ObRawExprUtils::try_add_cast_expr_above(ObRawExprFactory *expr_factory,
                 K(session->get_current_query_string()));
 #endif
     } else {
+      //setup implicit cast charset convert ignore error
+      ObCastMode cm_zf = cm;
+      if ((cm_zf & CM_COLUMN_CONVERT) != 0) {
+       //if CM_CHARSET_CONVERT_IGNORE_ERR should be set is judged in column_conv expr.
+      } else {
+        cm_zf |= CM_CHARSET_CONVERT_IGNORE_ERR;
+      }
       // setup zerofill cm
       // eg: select concat(cast(c_zf as char(10)), cast(col_no_zf as char(10))) from t1;
-      ObCastMode cm_zf = cm;
-      cm_zf |= CM_CHARSET_CONVERT_IGNORE_ERR;
       if (expr.get_result_type().has_result_flag(ZEROFILL_FLAG)) {
         cm_zf |= CM_ZERO_FILL;
       }