In order to reduce the uncertainty in the seismic fault interpretation, taking Xingbei development area of Songliao Basin as example and based on the fault transfer displacement/sepatation(D/S), quantitative discrimination criterion of fault segmentation growth on the plane is eatablished. The critical D/S value of the three periods(arrangement overlap ，initial break,total break)is 0.27 and 1. The research shows: ① Fault 278+273 in Xingbei development area is consist of fault 278 and fault 273 which are arrangement overlap and the quantitative discrimination criteria of fault segmentation growth and is reliable. ② The type of fault trap is corrected from single fault trap whose footwall tilting to isolated fault trap which is arrangement overlap.At the same time, the range of fault trap becomes significantly smaller. ③ The assessment of fault sealing is corrected from general evaluation to independent evaluation on fault 278 and 273 respectively. Therefore, fault combination correction has great significance on precise deployment of exploration and development in oilfield.