Phase 2 comprises three lines, which will increase the total length of the network to 147.5km by 2021. The first phase of the east-west Line 4 will be 24.2km long with 21 stations. Construction is due to begin next year and the Yuan 18.4bn project will be completed in 2021. Line 5 will be 24.6km with 20 stations and is due to be completed by 2020 at a cost of Yuan 19.3bn.

The Yuan 27.7bn Line 6 will link an interchange with lines 1 and 4 at Exhibition Centre in the southeast of the city with Fuzhou Changle International Airport. The 40.6km line will have 20 stations and is due to open in 2019.

Services on the three lines will be operated by a fleet of six-car type B metro trains. The maximum operating speed will be 80km/h on Lines 4 and 5 and 100km/h on Line 6.

Testing on the 24.9km north-south Line 1 from Xiangfeng to Xiayangcun began on December 30 and the line is expected to open later this year.

Ultimately Fuzhou plans to construct a 338.1km nine-line network with 215 stations including 26 interchanges with the aim of increasing rail's share of public transport trips in the city to 30%.