| People used natural conditions for the stations. Their main role was military defense, in addition to controlling of people movement, checking contraband goods, bringing criminals to justice and taxation. In the Qin and Western Han dynasties, the certificate system was matched up with the station system and gradually institutionalized. From the unearthed slips of the Qin and Han dynasties, we can see the contents, such as the punishment for people who tried to pass through the stations illegally, and the prohibition of contraband trade of horses, gold, irons and so on. Annals and unearthed slips enable us to understand the station system of the Qin and Western Han dynasties more.the functions of station made it related with other systems. In economic aspect , station had the influence to state economy by frontier market and customs duty , it is one of national regulation economy important measures. However, station which was on key communication lines cooperated with the system of post and frontier fortress. With this obviously, institution of station is one of the important country rules. |