Hi Hongkui,

Odoo has some good documentation explaining the process at https://www.odoo.com/documentation/12.0/setup/enterprise.html 
You basically have to add the enterprise code to your project and link it in odoo-server.conf like this:

addons_path=/odoo/enterprise/addons,/odoo/odoo-server/addons

After you've done this you have to install the enterprise module web_enterprise to get the enterprise layout and features available:

./odoo-bin -d <your_db_name> -i web_enterprise --stop-after-init

Regards,
Yenthe