The study of Shudao and the study of the history of the Three Kingdoms are two separate and related topics. The formation and extinction of the three countries are closely related to the Shudao. The war between the three countries also affects the development of the Shudao. This book is about the opening and evolution of the main roads between the Chang'an and Chengdu plains in the Han and Tang Dynasties, and the important place names along the line. The events related to these roads occurred in the Han, Wei, Jin, Tang and Song Dynasties, and the important events and individuels of the Three Kingdoms. This book provides a historical picture of the changing landscape from the Guanzhong Plain to the southwestern region in the middle ages.