For the problem of treating high water-cut of yanchang heavy oil reservoir after water flooding, a suited organic alkalis was selected on the basic of polymer- surfactant flooding. The recipe of ASP system was optimized by the tests of reducing oil water interfacial tension. By physical flow oil-displacement experiments, the oil displacing capacity of three chemical flooding was analyzed and evaluated. The result shows that the acid-value of yanchang was 1.95mg/g and the reservoir was fit to ASP flooding. The selected organic alkalis was ethanol amine which could decrease the oil water interfacial tension and had little effect to the viscosity of compound. The tested recipe was 3500mg/L ethanol amine +1500mg/L polymer 2000mg/L surfactant. The results of oil displacement experiment shows that the ASP flooding could enhance oil recovery efficiency more than P and SP flooding in the homogeneous and three layer heterogeneity models. The value of EOR was13.38% in the three layer heterogeneity model to aim to control water and improve production.