Abstract: Aquaporins as the selective channels of water and some other small molecules are widely distributed in mammalian reproductive systems. It has been suggested that aquaporins are involved in mammalian reproductive processes, such as follicle development, blastula formation, embryo implantation,
regulation of amniotic fluid volume, and so on. A series of changes have taken place in expression and localization of aquaporins in endometrium and blastula, which means aquaporins play an important role during the processes of blastula formation and embryo implantation.

Key words: Aquaporins, Endometrium, Blastula formation, Embryo implantation