Well, first you'll need to make sure that you have a sturdy tree. Cats are known for being very curious and playful, so it's important to choose a tree that won't easily fall over. Next, you'll need to find a way to keep the cat from climbing the tree. Some people use chicken wire to wrap around the base of the tree and attach it to the wall. Another idea is to place a small table or other furniture around the tree to block the cat from getting close. Finally, you can try hanging ornaments and other decorations higher up on the tree to discourage the cat from trying to reach them.