Using the recording data of the lengthwise profile (from Lingtai to Amquhu) and processing corrected traveltime depend on the station's height and the loessal thickness,the 1-D and 2-D crustal velocity structure in the area was obtained.Along the line in the west the crustal thickness is about 51 km and in the east only 44 km.The eastern of profile is the structure of Erduos Platform style.Guguan town is located in the boundary between geosyncline area and platform area.There is a P-wave lower velocity layer (LVL) which embeds in 15-20 km between Wushan and Zhangjiachuan.Combining the seismic wave's dynamical parameters of observed data,some over-Moho faults,containing the Western Fringe Fault of Erduos Platform-Liupanshan Mountain,the Northern Fringe Fault of western segment of Qinling Mountain and Wushan Fault with N-S direction,have been determined.