The boundary of wetlands of Lake Poyang was analyzed with RS and GIS tools based on the natural environment and ecological function.The area of wetlands was 3886km².The importance of ecological function was appraised based eco-environmental protection and social-economic development according to the theory of ecological function regionalization.According to the result of ecological function importance appraising, the wetlands could be divided into four zones as vital important zone, high degree important zone, important zone, and general important zone, with areas of 125km², 1387km², 2064km² and 310km², respectively.Some suggestions and countermeasures for wetlands protection were also put forward.