This study selected Jilgalang Town as the study region, evaluated the result of Grain for Green Project during 2000-2007 based on land suitability, calculated the reasonable returning area and noted the issues that should be considered in the future. The results can be concluded as follows: ① The arable land decreased while the woodland and grassland increased obviously, and the coverage of grasslands increased significantly since the implement of Grain for Green Project.② There were a series of problems during the past 7 years. As for the transform trend, area and spatial distribution of related land types, some farmlands that should be returned to forests were actually returned to grasslands; besides, some farmlands that should be returned to grasslands were actually returned to forests. The actually returned farmland only accounted for 28.63% of the farmland that should be returned to forests or grasslands according to land suitability. ③ In the future, 8 172.00 hm2 farmland should be gradually returned to forests or grasslands, among which about 73.29% should be returned to forests. ④ It was extremely important to formulate and implement some reasonable follow-up policies which should take more consideration of promoting the income of farmers so as to ensure both the ecological benefits and the economic benefits of the Grain for Green Project.