Abstract: n recent years, in order to study the activities along faults around and in front of the Three Gorges damsite, TL, ESR, FT, and U series dating methods have been use to date Xiannishan and Jiuwanxi faults. However, the obtained age data very scattered, so as to cant use these data. In this paper we suggest that: 1) appropriate time interval for dating methods; 2) back zero condition of samples; 3) implication of age of fault activities; 4) judgement of scattered age date; 5) disturbing factors for dating; 6) interference of geological background in dating results. Understanding the suggested above permits to select proper age data fit to geological background and more exactly evaluate the safety and stability of the Three Gorge Dam.