Abstract: Based on the belief of the first year of the reign of Shenlong during the Tang Dynasty and the article “A New Study of Li Bai's First Acquaintance with Meng Haoran”,this paper makes a new study of the friendship between Li Bai and Meng Haoran in their middle and late lives,with the conclusion that their middle and late friendship began in the autumn of the 17th year of the reign of Kaiyuan,when Li Bai wrote a poem in Liyang entitled “Reflection on the Past While Touring Wawushan of Beihuting in Liyang—to Meng Haoran”.In the winter of the same year,Li Bai wrote “Enjoying Snow in Huainan—to Meng Haoran”.And in the 23rd year of the reign of Kaiyuan,he wrote some other poems presented to Meng Haoran.

Key words: belief of the first year of the reign of Shenlong, friendship in the middle and late years