Studying on the change of land ecological function value has great significance to the sustainable use of land resources and ecological environment protection. Based on the remote sensing and Arc GIS platform,the image data in 2001 and 2011 were used to make land use classification. Through revising the value per unit area of terrestrial ecosystem in China by means of grain output method,the value of land ecological function and its change characteristics in Dongting Lake were analyzed. The results showed that the areas of grassland,water land and unused land decreased,and the grassland decrea...