Abstract: We used teleseismic records from the temporary and fixed stations near the Chenghai fault zone. The total of the stations is 27.We get the P-wave receiver functions of every station using the teleseismic waveform. We get the crust thickness and shear velocity using the time domain linear inversion method.The results show the depth of Chenghai fault belt change from 42 km in the south to 54 km in the north. The depth of Moho in the south is more different from the north. The Binchuan and its north eastern area show obvious low-velocity layer from the depth profile. The lower layer is related to the thermal material. Then in the south area of Yongsheng, the vertical change of S wave velocity is more drastical. Low speed and high speed layer exist alternately, which could be the reason why this area has many earthquakes. At the same time, we give the preliminary contrast analysis about the receive functions which were calculated using broad band and short-period seismographs.

Key words: Chenghai fault zone, Crustal depth, Reveiver function, Shear wave velocity