It is an important work to study on pollutant capacity and limitation of water pollutant gross in water function zone of water resources protection planning in the Dongjiang source area.According to the “Surface water(environment)functional zone of Jiangxi province” and “Ganzhou surface water function zoning”，combined with the present situation of water quality in Dongjiang River source，the types and characteristics of pollution sources，one-dimension，two-dimensional unsteady model and lake-bank uniform mixed attenuation model were used to calculate the pollutant capacity in the water functional area of the source region，and the total amount of authorized limit was approved：(1)COD and NH3-N contamination capacity were 1 246.23 t/a and 103.35t/a respectively，(2)The total COD and NH3-N limit were 819.24 t/a and 97.84 t/a respectively，and(3)the status of COD was 1 235.40 t/a，and the status of NH3-N in river was 1 116.60 t/a，COD and NH3-N into the river volume reduction rate of 34.37% and 91.89%，the need to reduce pollutants in the functional area of 17，the proportion of the total functional area of 94%.The main pollution index in the Dongjiang source zone is NH3-N，the Xunwu Water Xunwu reserve zone，the pollution source is the mine trace，the industrial pollution of Xunwu and Dingnan is serious，and the two industrial water function zones in Dongjiang River source need to be reduced the quantity of sewage.The research results can be used for reference in water pollution control of Dongjiang River source.