Based on the data of deep seismic sounding,gravity,magnetotelluric sounding and geotherm,two comprehensive geophysical sections are established in Tianshui earthquake area.Analysing the two sections,crust-mantle structure in the Tianshui area are studied.The results show that crustal thickness along fault zone in the north edge of western Qinling is thin,and low velocity layer,low density layer and low resistivity layer synchronously exist there.The facies change transition zones of tens to a hundred kilometers in width and up to upper mantle in depth exist on the both sides of the fault zone,which means that depth of the fault zone possibly is up to upper mantle.