It is the first set of stamps issued in China and occupies an important position in the history of stamp issuance, so it is even more precious. To commemorate the anniversary of the issue of Dalong stamps 1 10, the Ministry of Posts and Telecommunications issued a stamp sheetlet 1988 on July 20th, with the theme of a full set of three Dalong stamps, designed in the form of a ticket in a ticket. The success of printing with 7-color machine for the first time is rare in the history of stamp printing. The All-China Philatelic Federation held the "Dalong Stamp International Seminar" in Xiangshan, the China Stamp Museum held the Dalong Stamp Exhibition, the China Philatelic Publishing House published the Dalong Stamp Commemorative Album, and also produced the TV feature film "China Stamp TV Series (I)-Dalong Stamp".

The "Dalong" stamp is a copper plate, which is hand-carved by sculptors one by one. Because the imported papers are different, they are sent in three times. The first issue was released at 1878, and the second issue was released at 1882, named "Tissue Dragon". When typesetting, the spacing between each stamp is slightly larger, and the width of the stamp is 2 mm wider than that of the first stamp. The third issue was published in 1883. Paper is thicker than the first two, which is generally called "thick paper dragon". Because of the punch, there are two kinds of tooth holes, namely "Koga Thick Paper Dragon" and "Maoya Thick Paper Dragon". The bronze mold was damaged after Dalong stamped it.

In the Qing dynasty, stamps often had the pattern of "dragon", because "dragon" symbolized supreme authority and was the symbol of the supreme ruler. Recently, according to the research of Dalong stamp experts, it is believed that the designers of Dalong stamps are from China, not foreigners as previously speculated. However, it is difficult to find out the designer's name and exact issuing time, which has become an "unsolved case" in the study of the early stamp issuing history in China.

1878, the Qing government set up post offices in Beijing, Tianjin, Shanghai, Yantai and Niuzhuang (Yingkou), which were subordinate to the customs. In the same year, the Shanghai Customs Registration Office printed and issued a set of three dragon stamps. A golden dragon with five claws is drawn in the middle of the stamp pattern, which is lined with clouds and waves. The color and face value of stamps are different. The face value is calculated in silver: one silver (green, one silver).