Abstract: Li Bai’s “Fu on the Roc” is an important work to research whereabouts of his.There have been different ideas about the writing time of  “Fu on the Roc.” From the whereabouts and acquaintance of Li Bai and Sima Chengzhen it can be claimed that it was written in the spring of 14th year of Kaiyuan after LiBai returned to Jiangling from Kuizhou on a business trip.

Key words: Li Bai, Fu on the Roc, whereabouts and acquaintance