Based on the problems of rich heavy oil，serious heterogeneity and poor water drive development effect in Bohai reservoir，it is not ideal to using particle diversion agent or heavy oil emulsifier alone to enhance oil recovery. The performance of the complex system of emulsifier，polymer microspheres and gel dispersions for heavy oil in LD5-2 heavy oil reservoir in Bohai Sea and the effect of liquid flow diversion were studied by means of laboratory evaluation. The results showed that the median initial particle size of polymer microspheres was 8.7—9.2 μm and the expansion ratio was 2.5—3.0. The dispersion of gel dispersions showed irregular morphology in vitro，and the retarding swelling effect was not obvious. The adsorption of surfactant to diverter particles reduced the effective content of emulsifier in heavy oil and the effect of emulsification and viscosity reduction became worse. However，when the mass ratio of oil to viscosity reduction system reached up to 6∶4，it still had a good viscosity reduction effect. Compared with the particle steering agent alone，the particle steering agent in the binary composite system of heavy oil emulsifier/particle steering agent had good shear resistance，injectability and deep profile control and displacement ability. For reservoirs with large channel or extra high permeability，granular diversion agents must be combined with strong gel to exert synergistic effect of micro and macro fluid diversion.