To investigate how the presence of mosquito eggs or larvae in water affects the oviposition behavior of female Anopheles sinensis mosquitoes, this study assessed the oviposition preferences of female A.sinensis mosquitoes for the eggs or fourth-instar larvae of A.sinensis, Aedes aegypti, and Culex quinquefasciatus under controlled indoor conditions.The results revealed that A.sinensis females showed no significant preference for the eggs of their own species or those of C.quinquefasciatus in the water.However, they exhibited a notable preference for A.aegypti eggs at specific densities.Moreover, high densities of larvae from A.sinensis, A.aegypti, and C.quinquefasciatus strongly attracted A.sinensis females to lay eggs.These findings suggest that the presence of mosquito eggs and larvae can influence the oviposition-site selection of A.sinensis, with the extent of this influence closely tied to the density and species of the immature stages present in the water.