The tracking study of raising crabs during production period in the reclamation areas of Lake Gucheng was carried out in order to find out the economical benefits and pollution influx of different management modes.The results demonstrated that the crab eco-culture in the reclamation areas had a positive effect on the economical benefits.The profits,which could be affected by differences in the aquaculture management,ranged from ￥24000 to ￥105000 Yuan RMB per hectare.The major input was feed, which took up 41.6% of the total input of ￥63000 Yuan RMB per hectare.The total output was ￥103000 Yuan RMB per hectare.The concentrations of nitrogen (N) and phosphorus (P) varied significantly among different ponds,with a total N load of 268.5 kg/ha and total P load of 64.5 kg/ha.Feed made a major contributions in the input of N and P,70% and 90%,respectively;culture products and outflows only took a small amount of N and P loads,and harvesting aquatic plants was the main method to remove N (86%) and P (88%).Consequently,the key to improve the economic benefit,reduce pollution outputs and protect water environment of Lake Gucheng was to optimize the feedstuff structure,perfect the feeding system and strengthen the harvesting of aquatic plants for more effective pollutant transformation.