The Fuyu-Zhaodong Fault is an important buried seismogenic fault in the Songliao Basin.In 1119A.D.an M_S6.75 earthquake occurred on the fault,the largest ever recorded before the Haicheng earthquake of Northeast China in 1975.In 2006 and 2014 several earthquakes below MS6.0 occurred along the fault; these recent earthquakes were mainly centralized on the northeast segment and the Chaganhua segment.Active faults were detected in Songyuan city from 2012 to 2014 and the northeast segment of the Fuyu-Zhaodong Fault was proven to cross downtown with a near-EW trend and showed obvious segmentation and independence.The urgency and importance of meticulous detection of the fault is obvious for this urban environment.Using three-dimensional geophysical data from oilfield and shallow geophysical prospecting,the space distribution and profile characteristics of this fault (named the north Fuyu Fault) were determined.The combined methods of borehole detection and optical stimulated luminescence dating were also used to confirm the seismicity along the fault since late Pleistocene.Using the rupture scale of bedrock surface from the three-dimensional geophysical data,this paper estimates the seismic potential along the north Fuyu Fault and studies its probabilistic seismic risk using a probabilistic calculation method.A Poisson probability model is adopted and quantitative parameters,such as maximum magnitude,recurrence period,and occurrence probability in the coming 50~200 years,are calculated.This presents a breakthrough in the study of potential seismogenic faults that have few historical earthquake records and long return periods.