Today, 36 years ago, on May 5, 1989 (April 1, 1989), the Ministry of Postal Communications decided to implement the postal code in two stages in all the cities and villages of China.On May 5, 1989, the Ministry of Postal Communications decided to implement the postal code in two stages in all the cities and villages of China: starting with the written sender's postal code, transitioning to the postal code of both the sender's and the recipient's; the post office first from the artificial code separation processing of mail, transitioning to the use of machine separation processing of mail.