Abstract: Objective To analyze the movement tendency of marshland in Anhui section along Yangtze river,and the relationship between flood and the filling up or marshland and the formation of new marshland.Methods To survey the current status of marshland in Anhui province and the formation process of two newly marshland,the Chenqiao south beach and the Gonghe beach.To consult the research results about the relation between water and silts carefully.According to these results,to analyze the movement tendency of marshland and the relationship with flood.Results It takes on the tendency that more marshland is enlarger than collapse in Anhui section,the annual areas of growth accounted for 2 664 000 square meter in recent yreas.New islet also come up to water constantly,the breeding areas of snail enlarge continually.The variation process of water and silts is consistent totally in most years,the amount of silt changes with that of water,that is rich water and rich silts,middling water and middling silts,less water and less silts.Conclusion The marshland in Anhui section will filling up and stretch up,the areas will enlarge.The flood plays an important role on the filling up of marshland and the formation of new marshland,every year.The flood not only can accelerate the filling up of marshland and the formation of new marshland,but also can make for the transmission and spread of snail,which will influence the course of schistosomiasis control severely.