Abstract: Microgel flooding is a new technique to solve current problems such as polymer volume needed is large,tempera-ture and salt resisting ability are poor and compounding of polymer with wastewater is difficult.This paper studies the adaptability and influential factors of organic chromium/polymer microgel system in Xiaermen oilfield in combina-tion with the geologic features and development status.A optimal formulation of 400mg /L polymer+60mg /L crosslinker is presented.The post gel-forming viscosity of this formulation is higher than that of 1000mg /L polymer solution made up with the wastewater produced in Xiaer-men oilfield.This technique can lower flooding cost and solve the problem that viscosity of polymer solution com-pounded with wastewater is low.Dual-tube core flooding experiment showed that the recovery factor of microgel flooding was18%～21%higher than that of waterflooding.