Lake eutrophication has been a global problem today.Blue-green algae are found widely in nature lakes and bring in more nutrients and sediments which are the key elements of eutrophication.Simultaneously,toxic cyanobacterial blooms bring about a series of problems in the safe drinking water treatment.The aim of this study was to estimate the efficiency of water treatment processes in the removal of cyanobacterial toxin.Furthermore,the present situation of eutrophication research was discussed and the development tendency of the research was prospected.