One way to keep your cat away from the Christmas tree is to place tin foil or bubble wrap around the base of the tree. Cats are typically deterred by the noise and texture of these materials, so it's a simple yet effective way to keep them away from the tree. Another option is to use a motion-activated sprinkler, which can be set up around the perimeter of the tree to create a barrier that cats are unlikely to cross. Finally, it's also a good idea to provide alternative sources of entertainment for your cat, such as toys or scratching posts, to divert their attention away from the tree.