This text investigates the historical account of the Taoist master Ch'ang-Ch'un's arduous expedition across Central Asia to meet the Mongol conqueror Chingiz Khan. The author, Li Chih-Ch'ang, served as a disciple to the master and provides a firsthand record of the political and geographical landscape of the 13th century. The work functions as both a biographical tribute and a detailed chronicle of the cultural exchange between Taoist philosophy and the burgeoning Mongol Empire.

Historians and scholars of the Mongol period frequently cite this work as a foundational primary source for understanding the logistical and diplomatic realities of the 13th century. The text is valued for its specific observations on the terrain and the political climate of the era.