Hydrodynamic conditions,including the flow velocity,discharge and water disturbances,play a key role in the occurrence, development,continuation and extinction of eutrophication.In order to prevent and control eutrophication,it is vital to study the influence of hydrodynamic conditions on eutrophication.Hydrodynamic conditions can not only affect the growth and interspecific competition of algae,but also change natural environment and nutrient loads of the water body.More details are as follows.(1) The flow velocity has a very significant effect on algae aggregation and distribution,as well as nutrients and the dominant algae.It is also found that there is an adaption period of the growth of algae biomass to the change of the flow velocity.(2) Discharge makes an effect on eutrophication mainly by altering the flow velocity and water quantity.(3) Water disturbance,which mainly originating from wind and tide et al,directly acts on algae cells and groups in strengthening the aggregation of algae,as well as influences the mixture and transportation of nutrients in vertical and horizontal directions.Reynolds Number and the type of water circulation are also regarded as hydrodynamic factors,which can make influence to eutrophication.At present,the study of hydrodynamic conditions' impacts on eutrophication is still in the stage of qualitative research.Some key issues,such as the influence on nutrients,the law of hysteretic nature and critical value of hydrodynamic conditions,still need further study.