Abstract: Recent aeromagnetic mapping and data processing of geological materials for Northeastern China has disclosed that there are four parallel NW trending basement faults in the Songliao basin,extending in a N-50°-W direction and cutting,diagonally,the basin in rows of equal distance.These faults are sup-posed to be originally transform faults formed in the course of contraction of ocean during the Paleozoic time,later evolved into tension faults in the Mesozoic and compression faults in the Cenozoic.In view of the fact that the two NW trending faults in the central part of the basin pass through the Daqing and Fuyu oil fields,it is believed that they played an important role in oil and gas migration and accumulation.By analogy of structural conditions,the area on the periphery of Daqing in the neighbourhood of the NW fault on the northeastern flak of the Suihua depression is most prospective for oil search.