Methods to help cats develop a good habit of using litter boxes:

1. First, choose a litter box of appropriate size for your cat, and then place it in a fixed location. Do not move the position easily.

2. Choose high-quality cat litter and materials suitable for cats. It is best not to use scented cat litter.

3. Put the cat’s excrement in the litter box, so that when the cat wants to excrete again, it will look for the smell and find a place to excrete.

4. Look for the cat’s excretion pattern. When you see the cat wants to urinate, you can hold the cat into the litter box and wait until it has finished excreting before letting it out. After the cat has excreted, you can hold the cat's front paws and dig through the cat litter to bury the excrement.

5. After completing this series of actions, remember to reward the cat with snacks to let it know that it is the right thing to do. If you persist like this for a while, it will learn to use cat litter.