Well, there are a few ways to keep cats away from the Christmas tree. One way is to place a piece of tin foil or aluminum foil at the bottom of the tree. Cats don't like the sound or feeling of it and will typically avoid the tree. Another way is to place citrus-scented items near the tree, as cats don't like the smell of citrus. Additionally, placing a barrier around the tree, such as a gate or fence, can also help keep cats away from it.