In ancient times, the delivery of documents depended on post stations. Generally speaking, there is a post office every 20 miles. Once the official document that needs to be delivered is marked with the words "fly at once", it must be delivered at a speed of 300 miles per day according to the regulations. In case of emergency, the transmission speed can reach 400 miles, 600 miles and 800 miles at the fastest.

There was a post station (usually 30 miles) on the main road in the Han Dynasty, and there was a water post station in the Tang Dynasty. In the Song Dynasty, there were Ma Xie Pavilion and delivery shops in 20 miles, libraries in 60 miles, and express shops in every 10 in the Ming Dynasty. From the Tang Dynasty to the Kaiyuan period, there were more than 300 land posts, more than 260 water posts and about 70 land posts in China. Post offices are all over the country, with one stop every thirty miles.

Extended data:

The origin of post office

Simply put, the post station is a place where officials who delivered official documents and visited officials in ancient times rested and changed horses on the way. Later, its function gradually expanded and was finally replaced by new things.

The text post station appeared in Liaoning in the Tang Dynasty. The Five Classics written by Song people mentioned that the post station was located on Yingzhou Road in the Tang Dynasty: "Because of eastbound 180 Li (now Chaoyang City), it was sent to Yan Juncheng (now Yixian County), about 500 Li from Yan Juncheng to the east, passing through Ruluo Shouzhuo (now Beizhen Town), crossing the 17 th post of Liaohe River to Anduhu (now Liaoyang City)."

Although there is no specific station name mentioned here, we can know that the post office in the Tang Dynasty has been set up in Liaodong. During the Liao Dynasty, there were 14 post offices between Dadingfu in Beijing and Liaoyang in Tokyo. During the Jin Dynasty, a post station was set up between Huining House in Shangjing and Yanjing along the coastal highway in western Liaoning. In order to meet military needs and strengthen exchanges, Jin followed the example of the Song Dynasty in Liaoning.

Delivery shops are generally built near major traffic routes, with garrisons, like a small square fortress with black flags at four corners. The distance between shops is generally about ten miles, and there are four people in each department. The management is very strict and has the nature of the army. At this time, the delivery shop and post office are under the leadership of the Ministry of War. The post station provides accommodation, chariots and horses for past officials in accordance with the standards set by the imperial court. ?

Due to the vast territory and developed transportation, the post station system was strengthened in the Yuan Dynasty, which also became an important means to consolidate its political power. At this time, the post station is also called "station red", and the actual "station red" is a transliteration of Mongolian post station.

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