diff --git a/installer/install.conf b/installer/install.conf
index f7acba4ae3..637657ec76 100644
--- a/installer/install.conf
+++ b/installer/install.conf
@@ -15,7 +15,7 @@ DE_CONTEXT_PATH=
 DE_EXTERNAL_MYSQL=false
 ## 数据库地址
 DE_MYSQL_HOST=mysql-de
-## 数据库端口
+## 数据库端口 (仅使用外部数据库时才生效)
 DE_MYSQL_PORT=3306
 ## DataEase 数据库库名
 DE_MYSQL_DB=dataease
diff --git a/installer/install.sh b/installer/install.sh
index 610470def4..c83d49f87e 100644
--- a/installer/install.sh
+++ b/installer/install.sh
@@ -112,6 +112,7 @@ function prepare_de_run_base() {
    if [ "${DE_EXTERNAL_MYSQL}" = "false" ]; then
       sed -i -e "s/^      DE_MYSQL_HOST/      ${DE_MYSQL_HOST}/g" docker-compose.yml
       sed -i -e "s/^. DE_MYSQL_HOST/  ${DE_MYSQL_HOST}/g" docker-compose-mysql.yml
+      export DE_MYSQL_PORT=3306
    else
       sed -i -e "/^    depends_on/,+2d" docker-compose.yml
    fi