Lintong-Chang＇an fault is an important active fault near Xi′an city.It may affects the development expansion region of Xi′an.In this paper the activity of the fault is discussed by using high-resolution shallow seismic reflection,composite drilling and dating methods.The result of seismic reflection shows that some layers in Quaternary were offseted and the dislocated distances decrease from deep layer to upper one,means a continual longtime active of the fault.The geological sections of composite drilling shows that sand and clay layers of middle Plaistocene were cut and the displacements are in 8.7-2.5 m.All of this prove that active rate of the fault decreased from early to late Pleistocene Epoch.