On the base of analysing earthquake risk, geological and geophysical conditions for Zhongwei active fault zone where Daliusu dam-site located, the potential earthquake deformation and stress near the dam in the condition of earthquake with Ms6.5, Ms7.0 and Ms7.5 on the fault F201 in the fault zone are simulated using 3D finite element method. The calculation results shows that if an earthquake of Ms≥6.5 occurres on the fault F201, the ground earthquake deformation and stress would exceed the cracking limit of crust rock at least in the range of 3 km at south of the fault, the earthquake strain of Daliushu dam-site would be over 10.4 and the stress would be several megapascal （MPa）, which will lead to the anti-rupture problem hard to solve in engineering project yet.