Abstract: Plantanus acerifolia trees were treated with four chemicals. The results show:The sugar and nitrogen content of the buds increased in winter and decreased in spring, accelerated lengthening of young branch and the diameter of young branch become smaller. The ratio of C/ N of the buds and the number of flower buds on the shoot increased by the treatment of GA3 and ethionine, and decreased by the treatment of ethyhene and 2-thiourcail. This experiment offers some suggestions for selection of cone abscission-preparation for plane tree.