Abstract: Kai Ping Si Ji,which was written by Yuan Jue,was one of the representative works of Shang Jing Ji Xing Poetry in the Yuan dynasty.It came from Yuan Jues four experiences of accompanying the Emperor Renzong and Yingzong to Xanadu.Unlike the common Shang Jing Ji Xing Poetry which focused on describing local conditions and customs,Yuan Jues writing focused on using literature as a medium to showcase individual feelings of natural time changes and historical time changes.It also implied the changing times as well as his different emotions while breaking through a stereotyped writing way of Shang Jing Ji Xing Poetry.On the one hand,Kai Ping Si Ji was given a fluid meaning of time through unceasing conversation with Yuan Jue himself, others,and nature.On the other hand,co-editing these works in his late years also endowed Kai Ping Si Ji with particular historical value and demonstrated Yuan Jues profound consciousness as a historian.