The Xiannufeng and Jiuwanxi fault zones are tow major fault zones which are most adjacent to the Yangtze Three-Gorge Dam Site. To assess the danger of reservoir engineering project-induced strong earthquake and the stability of the regional crust, a fission-track geochronological study of apatite separated from fault gouge and cliff rock and country rock in the fault zones was conducted in this paper. In addition, statistical measurement of the fission-track length frequency distribution was also made. The study indicated that the Xiannufeng and Jiuwanxi fault zones were formed at 0.60?0.05 Ma B.P. and 0.29?0.04 Ma B.P. respectively, in sharp contrast with the main tectono-thermal age (22.30?1.8 Ma B.P.) in their peripheral country rocks. By comparing the result with other age data obtained by other dating methods, it is evidenced that there has been no sign of fault activity since the Holocene. Therefore, it is concluded that the Sandouping Dam Site is located in a regionally stable crust.