The Tea Horse Road is an ancient international transportation route formed by the tea and horse trade between the inland and southwest frontier areas in Chinese history. It originated from the Tang and Song dynasties (618 - 1279) and flourished in the Ming and Qing dynasties (1368 - 1911), once extending into Bhutan, Sikkim, Nepal, India, and even to the west Asia and the Red Sea coast of the east Africa.
As Tibet belongs to the alpine-cold region, the roasted barley flour, ghee, beef, mutton and other high-calorie food become their main courses. However, without vegetables, these foods tend to make people hot and dry and aren't easy to decompose in the body. Under this condition, tea becomes a good helper, which can not only decompose the fat, but clear the heat. Therefore, drinking butter tea has become a living habit of the Tibetan people. However, they don't grow tea.
In the inland, mules and horses were in great demand for civil service and military campaigns, which were in short supply. While there are good horses in Tibetan areas.
Thus, the complementary trade of tea and horse, namely "Tea and horse mutual market" emerged, which promoted the emergence of the Tea Horse Road. Later, along with trade, cultural exchanges also took place along the ancient tea horse road, which had an important positive impact on the integration of China's multi ethnic groups.
A simple map of the ancient Tea Horse Road within Dali