As per the official response from the National Immigration Administration's 12367 Service Platform, there are no specific restrictions set by Chinese border control authorities for unaccompanied minors entering the country.

Travelers are advised to check with their airlines before their trip to confirm if unaccompanied minors are allowed to fly, ensuring compliance with the airline's specific regulations.

According to the regulations of the Shanghai Municipal Bureau of Public Security, hotels in Shanghai can permit minors to stay alone in a room if they have consent from their guardian. Click here to register for accommodation.

Sources: National Immigration Administration, Shanghai Municipal Bureau of Public Security, IC