Abstract: The egineering site area for Datong Power Plant 2 is located in Datong basin at the northern end of Shanxi fault depression zone. On the western side of the basin there is NNE NE trending Emokou Kouquan fault which has continued to be active since late Quaternary. On the eastern side of the basin there is NE NEE trending Liu Lingshan fault which is still active at present. Inside the basin there is a series of NEE NE trending secondary faults, some of which are still active at present. However, the Shuiyu fault, the nearest to the engineering site ,has been active since 30～15 thousand years ago, but it well not affect the stability of the site.