Abstract: In this paper,the development of laser light scattering technique applied in blood cells' classification and counting in recent years is reviewed.Methods of multiangle light scattering,light scattering curve,ratio of light scattering intensities,multidirection light scattering and right angle scattering are introduced and evaluated,respectively.The theoretical light scattering models of blood cells are discussed.Finally,the problems to be solved and the research directions are pointed out.