For high-temperature and high-salinity reservoirs, the surfactant flooding is an important technical measure for enhancing oil recovery. But the study of emulsification effect on enhancing oil recovery was not given sufficient attention. To evaluate emulsification effect on oil recovery in Pucheng oilfield, two surfactants YD-G1 and SHY-1 are selected through the experiment of decreasing interfacial tension. The interfacial tensions between the two surfactants solution and Pucheng dehydrated and degassed crude oil can reach the ultra-low level of 10-3 mN/m before and after two surfactants solution putting into constant temperature oven of 120 ℃ in 30 days, which shows two surfactants have good thermal and salinity tolerance capability. Compared with the SHY-1 emulsion, the YDG1 emulsion of same mass fraction has lower water separating proportion, smaller average diameter, which shows YD-G1 solution stronger emulsification capability. The two kinds of emulsion are prepared by using dehydrated and degassed crude oil from Pucheng oilfield and the two surfactants. The YD-G1 solution which has stronger emulsifying ability has a better oil displacement effect than SHY-1,which illustrates that the emulsion is one of the key factors to enhance the recovery efficiency. The optimum injection concentration and volume are 0.3wt% and 0.5 PV by optimization of laboratory experiments. In the preferred injection mode, the surfactant flooding can improve the recovery factor of 13.5%.