Aiming at the problem of large viscosity and mining difficulty in Chenjiazhuang heavy oil production in Shengli oilfield， the ability of emulsified viscosity reducer to reduce the interfacial tension between oil and water and the ability to emulsify heavy oil were investigated，including emulsified viscosity reducer SS（anionic olefin sulfonates），SD（Anionic alkane sulfonates），nonionic emulsification viscosity reducer SF，SS+SF（mass ratio 1∶1）and SD+SF（mass ratio 1∶1）compound system. The microscopic experiments were conducted using SS，SD，SF and SS+SF systems. the experimental results showed that under the condition of mass concentration of 0.4% and temperature of 25℃，the interfacial tension between the simulated heavy oil and the emulsification viscosity reducer SD or SS system was 1.87×10^-2mN/m and 1.21×10^-2 mN/m，respectively，the viscosity of the emulsion formed with heavy oil，whose viscosity was 187 mPa·s，in mass ratio of 3∶7 was 42 mPa·s and 46 mPa·s，respectively. In the microscopic oil displacement process，the enhanced oil recovery rates of SD and SS anionic emulsification viscosity reducers system were 56.75% and 61.93%，respectively. Under the same conditions，the interfacial activity and ability to enhance oil recovery of SS+SF system was superior to that of the single component，the interfacial tension was reduced to 1×10^-4 mN/m or less，the viscosity of the emulsion with heavy oil was 30 mPa·s，and compared with the SF emulsifying viscosity reducing agent system，the recovery rate was enhanced by 14.9% . The emulsion viscosity reducing agent SS + SF was expected to be used as oil displacement agent in ordinary heavy oil field.