With the advancement of industrialization and urbanization,it is urgent to reinforce them anagement and prevention as well as control of damage to water environment function on lake wetlands.The article establishes the monomial and comprehensive loss rates by water pollution based on the calculation model and the original monitoring data from 1997 to 2006,through calculating the dynamic diversification of pollution loss rate of Yuehai wetland and analyzing its degree of environment function damage.Because the main source of Yuehai wetland is the withdraw nagricultural water,the total P,the total N,and BOD5 become the main pollutant.The index of permanganate is always the main factor of function damage of agricult uralirrigation.From calculated result of the comprehensive loss rate,annual pollution loss rate in fishery,habittion,and agricultural irrigation functions on Yuehai wetland are generally steady.However,for drinking water and swimming functions,annual pollution loss rate varies severely on the whole.