Pruning is to shape a beautiful tree, that is, to leave those branches in the right place for modeling. Under normal circumstances, the dead branches, diseased branches and weak branches of trees should be cut off first, and then the long branches, cross branches, parallel branches, reverse branches, terminal branches, radial branches, opposite branches and vertical branches that hinder trees modeling should be cut off. The incision should be smooth to facilitate healing. Pruning usually leaves no residual branches. In basic molding, only the sharp branches and leaves are controlled to keep the shape beautiful. It is not advisable to prune shoots too frequently during the growing season. Winter is the best time for pruning. At this time, the leaves have completely fallen, and the branch structure in the crown is clear. Pruning can eliminate unfavorable factors, improve the shape, and help to concentrate nutrients, so that the retained branches will grow better in the next spring. After years of pruning, the shape of bonsai will be gradually improved.