利用天然重复地震观测水库介质速度随时间的变化，采用射线追踪方法对三峡巴东地区的重复地震进行位置归一化处理提高观测精度。计算了巴东地区2004年5月至2009年10月M_L≥2.0 重复地震经射线追踪法校正后的P波走时差。结果表明，巴东地区的介质速度变化主要受三峡库水位的载荷变化以及库水渗透作用影响。

In this paper the authors monitor reservoir media variation with time by using repeated earthquakes, normalize the position of repeated earthquakes by using ray tracing to improve the precision, and also calculate the travel time of Badong repeated earthquakes(M_L≥ 2.0) from May 2004 to October 2009 by using ray tracing.The results indicate the velocity variation of crustal media may be influenced by water load and infiltration of Three Gores Reservoir.