Do I need to apply for the visa to China?.

Hello, I travel from Barcelona to Guangzhou the next 21 of december with Qatar airways, I arrive exactly the 22 of december, and three hours later, I fly to Hanói with Vietnam airlines, and the same when I come back to Spain the 5 of january. These are two different tickets because I fly with two companies. I need to pass the inmigration área because I need the boarding card to Hanói.