The dynamic process of the bone marrow and spleen CFU-E from the mice infected with Plasmodium berghei was observed and the growing curve of CFU-E of infected mice was compared with that of normal mice. Results revealed no significant suppressive effect on CFU-E by P. berghei infection. It is indicated that the maturity and differen-tiation of erythrocytes were the foundation of invasion and parasitism by merozoites.