1、 Technical mechanism: Based on the research and development of oil recovery functional microorganisms, through the combination of internal and external microorganisms, the microbial ecosystem in the reservoir is regulated, and the propagation and metabolites of microorganisms are utilized to realize the directional regulation of microbial community structure and the deep profile control of the reservoir. At the same time, the oil displacement mechanism of microorganisms is used to improve the oil displacement efficiency, reduce the water cut, increase the liquid production and finally improve the oil recovery Recovery rate of Plateau oil.   2、 Success stories: In many domestic oilfields, field tests have been carried out in different geological conditions, including low permeability, high temperature, high water cut and high salinity blocks, which have solved the formation problems to varying degrees and enhanced oil recovery by more than 5%. This technology can be used as an effective production technology to enhance oil recovery after waterflooding or polymer flooding, with simple construction, low investment cost and good economic benefits.   3、 Technical advantages: The combination technology of internal drive and external drive is used for field application. High throughput sequencing and microarray were used as tools to screen the strains and construct the bacterial library. According to the characteristics of different blocks, different functional strains and activator systems are selected, different slugs are designed, and microbial oil recovery technology suitable for specific blocks is formed. Green environmental protection, no damage to the formation, simple injection process, no special treatment of the produced fluid.