Abstract: The reed marsh wetland has important function in regulating the climate, purifying sewages, urging the silt anticorrosion, maintaining bio-diversity etc. But reed marsh wetland is developed all the time, the market value method, method of cost of afforestation, shadow engineering method, substitution method was used to evaluate the valuations of the ecosystem service of the Yalu River nature reserve,It supposes the reed wetland is all empoldered for the paddy field and evaluated its valuations of the ecosystem service．The result indicates:the value of the valuations of the ecosystem service of reed marsh wetland is 123.95×106 RMB yuan in the protection zone .And is 89.25×106 RMB yuan after empoldered for the paddyfield, valuations of the ecosystem service has been reduced by 28%. The wetland ecosystem service function of the reed is 8 items, they mainly show on regulating function of water and protecting soil, they partly account for the valuations of the ecosystem service of reed wetland 35% and 32%, the number of valuations of the ecosystem service is 4 items after it is empoldered to the paddyfield, it is shown as material production value mainly, accounts for 75% of the value of whole ecological service of the system.