Three eposodes of Himalaya movement had considerable appearences in Songliao Basin.The first one happened between Late Tertiary and Early Quaternary.The regional compressive stress of NE-SW direction resulted by the effect of Indian Plate led to the formation of Xiao Hingganling Mountains and the second Songhuajiang-Nenjiang de-pressed zone.The second one took place between Middle and Upper Pleistocene.The com-pressive stress of NW-SE or nearly EW direction resulted by the effect of Pacific Plate led to a large scale of hydrocarbon migration and accumulation

forming a number of anti-cline trapped hydrocarbon pools represented by Daqing placanticline.The third episode in Holocene restored the NE-SW compression that occurred in the first episode

resulting in a series of new hydrocarbon traps or hydrocarbon zones of NW-direction

and seriously reformed the NE-directional anticline trapped hydrocarbon pools.It is suggested that the main target of oil and gas exploration in Songliao Basin is to find new structural traps or hydrocarbon enriched zones of NW-direction.