If you want to keep cats away from your Christmas tree, there are a few things you can try. First, you can use an essential oil such as peppermint, which cats don't like the smell of. You can also place aluminum foil around the base of the tree, as cats don't like the crinkling sound it makes. You can also try using a motion-activated air freshener or even a motion-activated noise-making device to scare them away. Finally, you can keep your cats occupied with their favorite toys or activities, so they don't have time to bother the tree.