The possibility of induced reservoir earthquake would augment after Three Gorges Reservoir sluiced. Many scholars studied the effects of induced earthquake by the head of Three Gorges Reservoir and around. The problem about the influence of earthquake induced by reservoir on seismic risk analysis in Downtown Areas of Chongqing is worth to be studied.This paper analyzes and sub-partitions latent hypocentral distributions affecting Downtown Areas of Chongqing firstly, and concludes the latent hypocenter which plays the biggest role in seismic risk analysis based on seismicity characteristics and the feature of earthquake geology in Chongqing Area, and respectively presents their relevant seismicity parameters such as M0, Mu, b, etc. Secondly the attenuation relation of earthquake motion can be attained according to Conversion Intensity-Range accompanied by establishing attenuation relation of seismic intensity in Chongqing Area and by virtue of corresponding relations between intensity and motion parameter of Western America rich in records of earthquake motion.Finally the estimated value of designed motion parameter of different protected levelswill be obtained via adopting the software package of seismic safety evaluation criterion fromChina Earthquake Administration.It's shown that the influence of earthquake induced by Three Gorges Reservoir onseismic risk analysis in Downtown Areas of Chongqing is very low, and it will be obtained theseismic intensity, the attenuation relation of earthquake motion and the estimated value ofdesigned motion parameter of different protected levels, which is for reference to determinereasonable criterion of earthquake resistant protection and improve urban comprehensivedisaster reduction capacity.
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