Abstract: Traps are places to capture, aggregate and save the hydrocarbon and are also the most basic unit of hydrocarbon accumulation. So traps come to be the main objects of the hydrocarbon exploration. Now the research of remaining oil is hot. There are a lot of research methods. We can expand the study of remaining oil through its distribution, formation mechanism and influencing factors, thus we can evaluate the remaining oil comprehensively and use it to guide the oil field production and development to achieve the purpose of production increasing.