Line 4 of the Guangzhou Metro is a south-north line on the system that runs between and stations, spanning a total of with 24 stations (while not yet in service). The sections of the line from Xinzao to Huangcun and Feishajiao to Nansha Passenger Port is underground, while the section from Jinzhou to Guanqiao is above ground. Line 4's colour is dark green. Like line 5 and 6, trains runs with linear motor technology.