Fifty-three years ago today, on April 13th, 1972 (February 30th, 1972 in the lunar calendar), China restored its legal rights in the UPU. UPU is the abbreviation of Universal Postal Union. In 1874, representatives of 22 countries held the first international postal congress in Bern, Switzerland, signed a postal convention, the Treaty of Bern, and decided to establish the General Postal Union. In 1878, the General Postal Union held its second congress, and the revised Treaty of Berne was renamed the Universal Postal Convention, and the name of the organization was the Universal Postal Union. In 1948, the UPU officially became the specialized agency of the United Nations on international postal affairs, and its headquarters is still in Bern, Switzerland. UPU currently has 175 member states, which means that almost all countries in the world have joined this organization. The purpose of UPU is to organize and improve international postal services, promote cooperation in the international postal field, and carry out various technical assistance activities within its capabilities. Although with the rapid development of science and technology and its application in communication, the development of postal service is greatly inferior, but it is still favored by people because of its low investment, the ability to transmit physical objects with different amounts of information, strong confidentiality and rich feelings. China joined the UPU on March 1, 1914, but due to the Taiwan Province issue, New China was once rejected by the UPU. On April 13, 1972, the UPU Congress passed a resolution officially recognizing the government of the People's Republic of China as China's sole legal representative in the UPU. At present, China is a member of the Executive Council of UPU and the Postal Research Advisory Council. In fact, China's postal service has a long history. As early as the Yin and Zhou Dynasties, there was a postal office for transmitting information, and official documents and letters were transmitted by the post Pegasus. This form has been going on for thousands of years. It was not until the late Qing Dynasty that modern postal service appeared, ending the history of postal service only delivering documents for the official. Interestingly, unlike other countries, China has stamps first and post offices later. In 1878, China issued the first set of stamps-Dalong Ticket, and it was not until 1896 that the General Post Office was established. It turned out that in 1857, the Qing government assumed the responsibility of messengers of embassies of various countries, and later it was agreed that the documents of embassies of various countries should be sent to the same post station in China. In 1865, the Qing government handed over the delivery of embassy documents to the General Taxation Department. The scope of customs mail received and sent gradually expanded, which facilitated the issuance of Dalong stamps in 1878. Although the Dalong stamp was printed with the words Qing State Post Office, the post office had not been formally established at that time. It was not until 1896 that the postal service became independent from the customs and officially opened the post office.