Abstract: Microbial enhanced oil recovery technology is the use of microbial activity itself and its metabolites, acting on the fluid reservoir and the reservoir, so as to achieve the purpose of enhanced oil recovery techniques. Compared with other oil recovery technology, microbial enhanced oil recovery technology process is simple, wide application, clean, good economic returns, therefore, continue to arouse the attention of experts, but also caused microbial academia, industry, oil, petroleum geology industry and other related subjects of interest and concern. This paper analyzes the endogenous microbial EOR technology mechanism, in terms of using the devices, methods, analysis shows the effect of microbial oil displacement situation I sea area. Porous media endogenous microbial growth and stability of different growth media activation effect was compared. After water flooding through to the limit, further on endogenous microbial enhanced oil recovery.