Abstract: The modification progress in styrene-acrylate emulsion polymerization by means of adding trace functional monomers, and the particle design, as well as the polymerization technology are introduced. The effect of styrene-acrylate copolymerizing factors on latex particle morphology, such as the kinds of emulsifier used, the ratio of anionic tonon-ionic emulsifier, the ratio of styrene to acrylic ester in total monomers, the initialratio of emulsifier to monomer and the ratio of styrene to acrylic ester in core monomer,are studied through orthogonal experiment.