First of all, put the two cats in their own cat cages, and put the two carriers together. Although the cage doors are closed, the cats can see each other. Let them know each other first. In each other's presence, if there is no anxiety or hostility between the two after a period of time, it may mean that the two have been able to treat each other calmly.
Next, separate the two cats and keep them in different rooms. During this period of time, the cats are very sensitive. Although they are in different rooms, each other will know the other's existence. After a period of time, the two cats will be slowly put together according to the situation.
Finally, pay attention to the water basins and eating bowls for the two cats. They must be separated, and there must be two cat litters; and as a cat slave, you must not be partial, treat both cats fairly, and make all preparations to start enjoying the life of two cats. .