Aiming at the heavy oil of a certain block of one oilfield, the emulsifying viscosity reducer system was determined through formulation screening, the system was composed of 0.4% surfactant CD-1、0.2% NaOH and 0.07% polymer HPAM. At the oil-water volume ratio of 7:3, the viscosity of the obtained emulsion was 189.3 mPa·s, the viscosity reduction rate reached by 96.1%, at the same time, the stabilization time was up to 48 h. A good heavy oil recovery effects could be achieved and heavy oil recovery could be improved by combining chemical huff and puff with emulsification viscosity reduction. The process of chemical huff and puff technique of heavy oil emulsified viscosity-reducing was simulated using laboratory physical model, and the chemical huff and puff technology parameters of indoor simulation was obtained as follows through orthogonal experiment, injection volume was 16 mL, injection rate was 0.34 mL/min, shut-in time was 48 h, and injection temperature was 50℃. Finally, the effects of indoor stimulation showed that based on water flood (oil recovery ratio was 8.25%), and the oil recovery efficiency increased by 10.78% after the double chemical huff and puff process.