First, put both cats in their respective cat cages, and put the two cages together. Although the cage door is closed, the cats can see each other, first let each other know each other and know each other's existence. If each other is not anxious or hostile in the market after a period of time, it may mean that each other can already look at each other calmly.

Come again, separate the two cats and lock them in different rooms. During the time when the new cat just arrived, the cats have a high sensitivity. Although in different rooms, they will know each other's existence. After a while, they will slowly put the two cats together according to the situation.

Finally, please note that the water basins of the two cats and the bowls for eating should be separated, and there should be two cat litters; then as a cat slave, you must not be biased. Treat the two cats fairly, make all preparations, and you can start to enjoy the life of the two cats.