Currently eutrophication is increasingly serious and the main algae which will cause the eutrophication is blue-green algae.Microcystins is a kind of toxins which produced by blue-green algae and it possesses transmissibility and carcinogenicity. The toxicity and remove method of microcystins are summarized and efficiency of various technicals are contrasted. Based on the summary of domestic and foreign research, some treatment field in the future and the problems to be solved are also proposed.