Some people say that 318 is an adventure that must be driven in this life. Some people are greedy for the beauty of the road. Some people are nostalgic for the story of the journey. Litang as such a haunting place is Ding Zhenlitang, the Litang of the City of the Sky. Tea Horse Hushi, Shi and Litang depart from Chengdu, along the 318 National Road to the southwest, through Ya'an, through Kangding, over the "Kangba First Pass" altitude of 4298 meters of Zeduo Mountain Pass, this time from "Tianfu State" Chengdu has 654 kilometers, to the "City of the Sky". Litang is in the air, and heaven is on earth. Not like the tenderness of the south of the Yangtze River. The beauty of Litang is full of purity and wildness. This city of sky floating in the clouds has a blue sky and endless green fields, like a beautiful fairyland written by a poet. To the north to Qinghai, Nantong Yunnan, west to Lhasa, east to Chengyu, Litang as one of the five important stations on the Sichuan-Tibet ramp line, there is still an unquestioned geographical advantage. Looking at this "city of the sky" surrounded by distant mountains and grasslands, it is no wonder that Ding really loves his hometown so much. "Pearl of the Prairie", "City of the Sky", "World High City", "Home of Horse Racing", "Snowland Holy Land, are all its unique labels. "Cranes in the sky, with my white wings, I will not fly far away until Litang flies back." Cangyang Jiacuo once mentioned this vast wonderland. When you come to western Sichuan, you must come to Litang once.