| This article takes the wetland in Liaoning province as the researching object and chooses a typical region to each kind of type wetland. This article attempts to evaluate the esosystem service value of each kind of wetland in Liaoning by the market value method, the shadow price method, the travel allowance method, the opportunity cost method and so on, and analyse the result, then obtains the total value. The research indicat that:(1)The seriation of ecosystem service value of differents kinds of wetland in Liaoning province is pood, permanent river, rock coast, herbage swamp, bayou, shallow sea, delta, brine swamp of tideland, sand coast of tideland, permanent freshwater lake, silt coast of tideland.(2)The great contribution to ecosystem service value of the wetland in Liaoning province is the moisture adjustment function, its value accounts for the total value 41.0%; The biological resources value, the water supply function and the waste treatment function also have the great value, its value separately accounts for the total value 20.2%, 12.6%, 13.4%; Other functions have the small contribution.(3)The total ecosystem service value of wetland in Liaoning is 751.67 billion yuan/a. The value in unit area is 60510.45 yuan/hm2. This is 1.49 times to the GDP in unit area of Liaoning province. The value of pond is 47.98% of the total value; The value of river is 29.48% of the total value; The value of offing and coast is 18.73% of the total value; The value of swamp is 3.68% of the total value; The value of lake is 0.13% of the total value.(4)The characteristic of the spatial distribution of ecosystem service value of Liaoning's wetland is that the east, south and the middle area is higher, the west and north area is low. The city that has the greatest ecosystem service value of wetland is Shenyang, its value is 119.79 billion yuan/a. The smallest is the Anshan, its value is 15.85 billion yuan/a.
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