Based on the survey and study of active faults at three sites, i.e. Yaodian, Shiheyang and Dujiapu on the north bank of Weihe River in Xianyang, Shaanxi, this paper probes into the methodology of survey of the loess-covered active faults coincident with terrace scarps, and presents the displacement amount of the Weihe Fault zone at Shiheyang in Late Pleistocene. At Shiheyang, exploration of the Weihe Fault zone was carried out by means of shallow seismic prospecting, drilling, topographic analysis and age dating. The initial survey result showed a displacement of 17.94 m of the stratum S1 on the Weihe Fault zone. The causes leading to this false result were mainly due to incorrect judgment on geomorphic unit, and followed by the so big spacing of drill holes that the subtle change of strata tilting due to erosion couldn’t be seen.
