This is a critical time for the tree to store nutrients, so it's best to wait until half a month after the leaves have fallen to prune.

At that time, thin out (cut off from the base) the skirt branches that are less than 1 meter from the ground; keep 3-4 large branches at the top that reach out evenly in different directions, saw off the center stem that grows upright from the branches, and cultivate a delayed open-ended shape.