Microcystin(MC) is a group of cyclic heptapeptide hepatotoxins produced by cyanobacteria in freshwater.With the increasing of water pollution,more attention have been paid to the potential health risks of MC on animals and human.The distribution and accumulation of MC in different aquatic products were described in this review,in order to investigate the regular pattern of MC contamination and to provide reference for evaluating the safety of aquatic products and preventing MC pollution.