Abstract: Environmental cost of aquaculture in pond was assessed,using the replacement cost method,material balance method,contingent valuation method(CVM)and COD price method.Results of the assessment show a decreasing order of replacement cost method (4400RMB·a^-1·hm^-2),COD price method (4191.99RMB·a^-1·hm^-2),material balance method (3925.76RMB·a^-1·hm^-2),and contingent valuation method (2007.8RMB·a^-1·hm^-2).It is held that the assessment using the COD price method is probably the closet to the true value of the environmental cost on the premises that the costs of time and money are not counted.The environmental costs estimated using the four methods account for about 6%-14% of the total economic profit of the operation,which indicates that it is necessary to adopt relevant measures to administer aquacultural pollution of the environment.