1. Provide enough indoor activities: provide cats with abundant toys and activities, such as cat climbing frames and balls, so that they can enjoy happy time indoors and reduce their desire for outdoor activities.
2. Conduct proper training: Teach cats not to yell at the door through the principle of rewards and punishments. When it doesn't bark, give rewards in time, such as delicious cat snacks. When it barks, it can be punished by sound or water spray, so that it can gradually understand that shouting will not get what it wants.
3. Increase the stimulation of indoor environment: improve the indoor environment, such as adding elements like jumping platform and resting nest that cats like, so that they can feel the indoor environment more interesting and comfortable, thus reducing their desire for the outside world.
4. Safe outdoor experience: If conditions permit, try to provide a safe outdoor environment for cats, such as a closed balcony or yard. In the case of ensuring safety, cats can feel nature outdoors and reduce their desire to go out.