We analyzed the effects of land use change on ecosystem service value in the Arhorchin Banner using the land use data of 2000 and 2005,and referring to the table of Chinese land ecosystem service value of unit area which was established by Xie Gaodi etc..The results indicated that from 2000 to 2005,the area of farmland increased 13.39%;the area of forestland decreased 0.43%;the area of grassland decreased 2.29%;the area of water increased 0.86%;the area of wetland decreased 0.64%;the land area of rural-urban,industrial mining and residents increased 12.02%,and the area of unused land decreased 0.25%.The total ecosystem service value in the Arhorchin Banner decreased from 12.87×10⁸ yuan to 12.83×10⁸ yuan during the period of 2000 to 2005,and there was a 0.31% net decrement of 0.04×10⁸ yuan.The decrease of ecosystem service value was caused by the land use change,specifically the great increase of farmland and the decrease of grassland.