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The estimation on the distribution and risk of Yitonghe faults plays an important role in civil development and planning of Changchun City�� Based on regional geological survey and geophysical data��the authors have confirmed that the Yitonghe faults distribute in north-south trending with west dipping and large dip angle�� which was used the methods of surface electric survey��ground penetrating radar detection and reflection seismic survey�� Through the radar detection��the authors infer the Yitonghe faults as Quaternary active faults��cutting off the Cretaceous formations��and define the Yitonghe faults as high torsional faults in Yitonghe erosion valley�� Since Quaternary��especially the late Pleistocene��the Yitonghe faults have tended to stable��with small probability of moderate-strong earthquakes��