Prepare a litter box of the right size to let the cat in and out freely. When the cat wants to pat the toilet after eating, take the cat to the bedpan immediately. When it has finished urinating, pull one of its front feet and gently scrape a little padding to cover the excrement. After these actions are completed, snacks will be rewarded and praised immediately. After many trainings, cats will get into the habit of using their own litter box.