Abstract:The loyalty to master has a very long history, but it was more striking in dynasties in turmoil like Spring and Autumn, Three Kingdoms, Song, Jin and Yuan. The consciousness, principle and phenomena of such loyalty in Secrets of Mongols were relatively more strong and universal. During Yuan Dynasty, Mongols controlled the language power of main flow, and the consciousness of such loyalty might have become one of the time spirits. This was reflected in artistic forms like novels and operas. Such phenomenon in The Legend of the Three Kingdoms was the output of combination between Mongols’ loyalty culture and stories concerning the Three Kingdoms.