The Lintong-Chang’an fault，one of active faults in the Weihe basin，is a boundary fault between Xi’an sag and the uplift of the Lishan mountain． The fault position and strike in the northeastern section is clear because of the fault scarp geomorphic characteristics． In the southwest section (west of Shenhe plateau)，however，the surrounding landform is flat terrain formed by late Pleistocene alluvial fan，and hasn’t any fault geomorphological features． The position and strike of the fault on preceding knowledge in this area was based on some speculations，not supported by any evidence data． In order to study Lintong-Chang’an fault location and direction in the southwest direction within the region，three seismic prospecting lines with a total length of nearly 27km and one geological drilling profile were carried out． The seismic interpretation shows that an anomaly，north dipping fault，presents in all prospecting profiles． The geological drilling profile，arranged in one abnormal place，reveals that discontinuity exists in the upper Pleistocene and Middle Pleistocene strata． These prospecting abnormal points locating basically along a straight line are considered to be the north fault of Lintong-Chang’an fault zone， FN． It goes in direction with approximately SW240°，continuation of the Lintong-Chang’an fault zone in the middle section，and continues to extend to the southwest．