To make an appointment for visa extension, renewal and reissue, you could visit the official website of Public Security Bureau of Shenzhen Municipality, specifically as the following:
Visa extension:
https://msjw.ga.sz.gov.cn/crj/crjmsjw/wsyy/ajax/msjwsxMenu.html?ywpid=000100
Visa renewal:
https://msjw.ga.sz.gov.cn/crj/crjmsjw/wsyy/ajax/msjwsxMenu.html?ywpid=000200
Visa reissue:
https://msjw.ga.sz.gov.cn/crj/crjmsjw/wsyy/ajax/msjwsxMenu.html?ywpid=000300
(Just click on the links above for the corresponding services)
