The first phase project of Tianjin Metro Line 8 starts from Ziyang Road Station in the west, passes through Tiantuo North Road, Anshan West Road, Xinxing Road, Xikang Road, Machang Road, Yong 'an Road, Qiongzhou Road, Jiefang South Road and Planning Sishui Road, crosses the original thermal power plant and Changtai River, and reaches the salt water station through Sishui Road, Weishan South Road, Tongyan Road and Jinnan Ring Road.

The total length of the project line is about 33 kilometers. Shuanggang Depot is newly built on the south side of Nankai University and Tongyan Road, and the 1 10KV main substation is newly built near Lvshuiyuan. There is a 1 10KV main substation in the annex building at the intersection of Sishui Road and Meilin Road.

As can be seen from the route direction, the first phase of Metro Line 8 is the southern backbone line of the central city. It passes through Nankai, Heping, Hexi, Jinnan District, Anshan West Road Science and Trade Street, Wudao Customs District, Xiawafang Commercial Circle, Jiefang South Road Residential District, Shuang Gang Xinjiayuan Residential District and Tiannan Campus of Haihe Education Park.

At present, the first phase of Metro Line 8 is planned, and the preliminary work is being organized. It is expected to open in 2022.