Abstract:Shunyi fault is one of important buried faults in Beijing plain. The Quaternary activity and ground deformation of this fault are significant work for optimizing the pattern of land space development, and constructing disaster prevention and mitigation system in Beijing. As result of the buried active fault is complex, we used the controlled source audio-frequency magnetotelluric (CSAMT), shallow seismic reflection, high density resistivity and drilling exploration to detect its location, character and activity intensity. The results show that the trending of Shunyi fault is NE, dip direction is SE, and it is a normal fault. Meanwhile, Shunyi fault is an active fault, its vertical activity rate was 0.16mm/a since the Early Pleistocene, 0.07mm/a since the Mid-Pleistocene, 0.29 mm/a since the Late Pleistocene, and 0.54 mm/a since the Holocene in Beixiaoying town. However, in Sunhe town, its vertical activity rate was 0.07mm/a since the Mid-Pleistocene, 0.28 mm/a since the Late Pleistocene, and 1.90 mm/a since the Holocene. There were spatial and temporal disparities in the Shunyi fault activity since Quaternary. It activated strongly in the Early Pleistocene, however, activated weakly in the Middle Pleistocene. In the Late Pleistocene, The activity of Shunyi fault enhanced, and in the Holocene it had the strongest activity since Quaternary. It"s worth noting that south segment of Shunyi fault had stronger activity than north segment since the Holocene, and is still creeping nowadays, which may explain why the ground fissures appeared in Shunyi recently. Obviously, active faults control ground fissures in Shunyi area.