Line 4 of the Shenzhen Metro, formerly branded as the Longhua line, runs South-North from to . The line serves Futian District and Longhua District of Shenzhen.

The line originally used 4-car trains, making it extremely crowded; although it still carried over 250,000 people daily, peaking at 516,100 on 5 May 2014. Stations feature electronic passenger information