Based on the building of gray system prediction model for locust current annual incre-ment of high and breast diameter,we advanced a managerial principle for the artifical locust for-est in Changwu agri-ecology experimental station,that we should use the forest as its early stageand take fostering small pole as the objective,so as to raise the economic benefit of locust forest. In the general terms,the most economic cutting age is 14～18 years