Abstract: Lengjia-Leijia area is located in middle part of Liaohe western depression.According to high resolution three dimensional seismic data,fine interpretation of fault and faulty system,stratum position and local structure has been determined and the trap characteristic has been analyzed.The study area is controlled by north east main fault,and is formed with three secondary structural belts of Chengjia fault sag,anticline belt and slope belt.This area faulted structure developed,the fault activity is complex,the oil-bearing stratum is numerous,the oil deposit type is diverse. The research indicated that the tectonic deformation is the key factor of oil and gas accumulation,the fault,anticline tectonic development plays important role in basin sedimentary facies belt development and source,reservoir,seal rock and distribution of hydrocarbon reservoir.The geotectonic condition research is vital importance in the entire process of oil-gas exploration.