Since the establishment of water post station in the Tang dynasty (618-907) in the Three Gorges area, the mileage remained unchanged, but the number of post station varied in different dynasties.

This paper gives a presentation on technical reform of Taipingyi Hydroelectric Power Plant.

Practice or project owner responsibility system in Taipingyi Hydropower Station;

The underground powerhouse at the Taipingyi hydropower station is consisted of 28 caverns with large size,many cavern intersections,large amount of rock bolts and shotcrete and crane beams on rock wall.

The antecedent geological survey for the powerhouse area of Taipingyi Hydropower Station basically reflects the actual geological conditions of rock body in the area so that it has an important significance for the general layout of powerhouse.

However, Zhaotong people, with tremendously strong stamina, cut and dug numerous post roads and horse roads leading to the outside areas among the high mountains and towering ridges or by the sheer precipices and overhanging rocks and they left thousands of traffic place-names of roads, bridges, ferries, passes, positions, etc.

The post assistant s background of the Ming Dynasty was mean and their official rank was also low.

Traditional operas of Yuan-Dynasty has reported a variety of circumstances such as Yuan dynasty postal post kinds,organizational system,functions and lives of post officials.