Abstract: It is known that ASP flooding can not only expand the swept volume but enhance the oil displacement recovery as well. Since the research of ASP flooding developed in Daqing oilfield, the matching technology of ASP flooding has been formed. With the decreasing potential of polymer flooding in major reservoirs, polymer flooding and ASP flooding have been adopted to realize the production of the remaining reservoirs. Based on the research of field testing, the proper well pattern and injection parameters have been determined, which, therefore, have a clear understanding of its effective characteristics and formed matching technology to enhance the production. The application results indicate the ASP flooding of class-II oil layers is feasible and can enhance the oil recovery by 20%, providing technical support for the sustainable development of oilfield.