In this paper，we relocated earthquakes sequences occurring in the border area between Guangdong and Fujian Provinces from June，2007 to May，2010 using the doubledifference location algorithm． During relocating，the cross correlation of waveform data and seismic wave travel time were used． The repeating earthquakes were selected according to the relocated result． We normalized the position of repeating earthquakes by using ray tracing． The accuracy of P-wave travel time can be improved by using ray tracing and cross correlation of waveform data，and the crustal media variation can be measured． According the calculation routine，P-wave travel time difference of the Shantou and Chaozhou seismic station retained negative anomaly from June to August，2008． After contrasting with seismic activity and crustal deformation of the Shantou and Chaozhou seismic station，we believe that the negative anomaly from June to August，2008 indicated the short-term velocity variation of crustal media．