There are a few things you can do to discourage your cat from climbing your Christmas tree. First, make sure the tree is properly secured, either with ropes or stakes, to prevent it from tipping over. Next, try placing deterrents around the base of the tree, such as aluminum foil or double-sided tape. You can also try spraying the tree with a bitter-tasting solution or placing citrus-scented items near the tree, as cats often dislike these smells. Finally, make sure to give your cat plenty of other toys and activities to keep them occupied and away from the tree.