In the history of Purple Gas Coming from the East, during the reign of King Zhao of Zhou Dynasty, Yin was ordered to pass Hangu Pass. One day, he suddenly saw a purple gas cloud steaming in the east and thought there must be a real person here. When Han and Liu saw their parents riding green, they said to You Xian Biography: "I traveled westward, and when I saw a purple floating in the shade, I rode a green cow." Tang Du Fu's Poems on Du Caotang Volume 32 Autumn Xing Part 5: "Looking at Yaochi in the west, the Queen Mother will come, and the purple customs will be filled in the east." In other words, this matter. Hong Qingsheng's "Dancing Disc in the Palace of Eternal Life": "Purple gas comes from the east, Yaochi looks from the west, and bluebirds fall in front of the court." Guan Ling made Yin an admirer of Taoism, so he asked Lao Zi, "My son will be hidden and Xinjiang will write a book for me." Lao Tzu stayed and wrote on the bamboo slips, "Tao can be Tao, extraordinary Tao;" The Tao Te Ching with more than 5,000 words (according to Laozi) means that if you go west, you will never know what it will end up in. Today, before Hangu Pass, there is hope to build an air station. Purple gas comes from here. During the Spring Festival, there are many books on Spring Festival couplets, such as "Purple gas comes from the east, happiness comes from the west, sunshine comes from the south, wealth comes from the north", and the lintel book "Purple gas comes from the east". In order to commemorate Laozi's book writing, the old residence of Laozi, observation deck and exhibition pavilion were built in the northern part of Taolin old county in the Tang Dynasty, which was an important landscape of Taolin county, but it was destroyed by fire in the late Qing Dynasty and early Republic of China. The local centenarian said that there are Yin's former residence, Laozi's Confucian Classrooms and the Pavilion of Scriptures in the city. After the reconstruction of Tang, Song, Yuan, Ming and Qing dynasties. Now there is only one temple left, and the stone tablet of Taichu Palace was rebuilt in the tenth year of Shunzhi in Qing Dynasty. The pillars in front of the temple and the four-year stone tablet of Yuan Dade became rare cultural relics.