Conglomerate reservoir，developed in the eastern No.7 district of Karamay oilfield in Xinjiang，has entered the high water content period after polymer flooding. However，it still has high potential and high value of development. SP and ASP flooding are two commonly used development models of enhanced oil recovery after polymer flooding in the conglomerate reservoir. The physical simulation experiment was carried out in the laboratory using natural core plugs. Injection pressure，water content，recovery ratio and remaining oil distribution of SP and ASP flooding after polymer flooding were analyzed. Development model after polymer flooding in the conglomerate reservoir was optimized. The experimental results show that the difference of water content and injection pressure between SP and ASP flooding was small，and the recovery ratio of ASP flooding was slightly higher than that of SP flooding. Moreover，core slice after SP or ASP flooding were observed by ultraviolet fluorescence microscopy，and the microscopic distribution type of the remaining oil was analyzed. It is found that the remaining oil after ASP flooding is mainly adsorbed in interparticle pore，which is likely to plug flow channel and hard to be driven. And the remaining oil after SP flooding is mainly adsorbed onto the surface of particles，which is less harmful to reservoir and the subsequent development. Considering the recovery ratio，construction cost and reservoir damage，SP flooding is chosen as the way to improve oil recovery after polymer flooding.