Which documents are required for beijing 24/144 hour visa free permit?

• A valid passport: Of course! You’ll have that with you anyway to board your flight.  
• An Arrival/Departure Card that is complete including nationality, name, flight number, passport number, place of issuance, visa number, date of birth, gender, and purpose of visit. On your flight to Beijing, the flight attendant will provide you with China Customs Entry Card and Health & Quarantine Declaration Form; ask assistance from the flight attendant and complete these cards before landing. 
• A ticket with a confirmed seat number for the next flight that leaves within 72 hours.This is important. They want to know that you are already booked to leave within the required time period.
• A visa for a third region or country if required. If your country of destination doesn’t require a visa, you can ignore it .