Abstract: By pretreating Plosmodium yoelii yoelii-infected erythrocytes with saponin combined with glutaraldehyde in hypotonie buffer solution, the process of schizogony such as the formation of bud, apical complex, and trilaminate pellicle of the merozoites were clearly demonstrated under TEM.An organelle, which consisted of several saccules arranged in a parallel fashion together with a cluster of small vesicles, was seen in mature gametocytes near their nucleus. It was supposed to be the Golgi apparatus in terms of its morphological feature.