Is it okay to bring a girlfriend of 15 years old to the hotel with a male ID card of 17 years old?

If you have an ID card and are over 16 years old, you can check in at a regular hotel.

According to the requirements of the public security department, all guests entering the hotel need to bring their ID cards to the front desk to register.

Usually, most hotels in China will accept guests who can provide their own valid ID cards. Unless there are express provisions in individual hotels.

Passengers must have one card for accommodation. Minors' accommodation registration, like adults, must be registered with valid identity documents. Minors who have not applied for resident identity cards can register their accommodation in the household registration book.

You can check in. Your girlfriend is under 16 and can't stay. Generally speaking, staying at home for seven days is definitely not acceptable, because only your ID card can meet the requirements. A small hotel will do, and an ID card will do.