diff --git a/src/sql/resolver/ddl/ob_alter_table_resolver.cpp b/src/sql/resolver/ddl/ob_alter_table_resolver.cpp
index 24ed18420a..15731de35f 100644
--- a/src/sql/resolver/ddl/ob_alter_table_resolver.cpp
+++ b/src/sql/resolver/ddl/ob_alter_table_resolver.cpp
@@ -205,6 +205,8 @@ int ObAlterTableResolver::resolve(const ParseNode &parse_tree)
     if (OB_SUCC(ret)) {
       alter_table_stmt->set_tenant_id(table_schema_->get_tenant_id());
       alter_table_stmt->set_table_id(table_schema_->get_table_id());
+      alter_table_stmt->get_alter_table_arg().alter_table_schema_.set_charset_type(table_schema_->get_charset_type());
+      alter_table_stmt->get_alter_table_arg().alter_table_schema_.set_collation_type(table_schema_->get_collation_type());
       if (table_schema_->is_external_table()) {
         ObTableSchema &alter_schema = alter_table_stmt->get_alter_table_schema();
         alter_schema.set_table_type(table_schema_->get_table_type());