Longwangchong fault is a NNE trending fauIt in carbonate rocks, southwest Hubei,crossing the proposed Banxia damsite on the Qingjiang River, The emphasis in the paper isput on the study of the traces of tectonic activity, seismic risk and stability of the proposeddamsite on the basis of field investigation.

It is found that the reverse Wulong fault (south segment of the Longmenshan center fault zone), at the northern of Wulong village, offsets the stratum of TL age 92.

In this paper by utilizing the mobile short-line leveling data across the Longmenshan fault the variation characteristics at each observation site before and after the Wenchuan earthquake are analyzed.

The fitting results shows that:the wholly velocities of Xianshuihe and Longmenshan fault is 8.

The results show that before the earthquake the regional deformation were staged,in detail,its differential elevation and subsidence weakened and the movement of Longmenshan fault turned from active to locked,after the earthquake,the earthquake effect spreaded north-east ward along the Longmenshan fault mainly and the co-seismic deformation nearby the after s.

The EW-strike Qinglong fault zone, which is located in Northeastern Hebei and western Liaoning, is within the eastern segment of Yanshan orogenic belt.