To keep cats off your Christmas tree, it's important to take a few precautions. First, make sure the tree is stable and secure, and use a tree skirt to cover the base. Next, try to keep the tree away from areas where the cat can easily jump or climb onto it, such as next to furniture or near windows. You can also use deterrents like double-sided tape or citrus-scented sprays to discourage the cat from getting too close. Lastly, make sure to provide plenty of alternative activities and toys to keep the cat occupied, so they don't feel tempted to explore the tree.