【Objective】To investigate the development and morphology of two dominant parasitoids Eretmocerus furuhashii and Encarsia bimaculata of Bemisia tabaci in South China. 【Method】The postembryonal development and ontogeny morphology of two aphelinid parasitoids were investigated by anatomy and microphotograph.【Result and conclusion】Both parasitoid species experienced seven stages in one generation, including egg, 1-3 instar larvae, prepupae, pupae and adults, but the developmental time of Er. furuhashii was obviously longer than that En. bimaculata. With the developmental time increased, the body length and width and head of length and width of both parasitoids enlarged. In general, the body and head length and the body and head width of Er. furuhashii were all significantly larger than those of En. bimaculata.