Abstract: The purpose of this paper is to evaluate the value of the wetland ecosystem service in Chongqing,then provide scientific basis for Chongqing wetland ecosystem management,evaluation of wetland ecosystem service and ecological compensation. Such six aspects as water adjustment,water purification,climate regulation,biodiversity protection,recreation,education,scientific research including eight indexes were selected for the evaluation of wetland ecosystem services. Through the assessment of them,the total wetland ecological benefit in Chonging was 48.134 billion Yuan in 2013, which accounted for 3.80% of GDP in Chongqing. The value of wetland water adjustment was 26.399 billion Yuan. In water purification,the worth reached 5.39 billion Yuan. The benefit of atmosphere regulation was equal to 3.851 billion Yuan. Biodiversity conservation value reached 458 million Yuan. The recreational value was 10.925 billion Yuan and the value of education and scientific research was near 1.111 billion Yuan.