Abstract: Based on the ecological province-construction and the perfection of land use programming,the article studies the principle of land ecological environment evaluation and especially the index system.According to the selection of index,the author chooses four restrictive indexes and seventeen real indexes and makes a measure and evaluation beyond the aim of ecological province-constrution on the year of 2004. Finally, under the supervision of the index system of the land ecological environment evaluation, the author undertakes the regional partition of ecological environment in Jiangsu Province,and the result is that it could be devided into three grades：land ecological region,land ecological subregion and land ecological environment cell.