If I have checked in at one hotel, can I check in at another hotel?

I can't. The public security department requires the hotel industry to implement four entity registration. Real name means that the check-in person is consistent with the identity documents presented, real number means that the registered number is consistent with the actual check-in number, and real number means that the actual check-out time is consistent with the time uploaded to the travel system. Therefore, if you stay in one hotel, you can't stay in other hotels.