Abstract: Shengzong Yelv Longxv is one of the most successful emperors of Liao Dynasty，who made national strength reach a peak during his reign.In his early succession to the throne，Longxv gained the honorific title of “Notable Saint Emperor”，and then he got the following honorific title：“Heavenly Auxiliary Emperor”, “Virtuous Pious Notable Saint Emperor”, “Vast Brilliant Virtuous Fortunate Reasonable Sincere Pious Sagacious Notable Saint Heavenly Auxiliary Emperor”, “Virtuous Brilliant Heavenly Fortunate Great achievement Reasonable Sincere Pious Sagacious Notable Saint Heavenly Auxiliary Emperor”. His posthumous title is “Brilliant Fortunate Pious Xuan Emperor”. The Eulogy of Shengzong Emperor and record of the people in the Song Dynasty can supplement The History of Liao Dynasty. But the people in the Song Dynasty mistook that Shengzong Yelv Longxv’s honorific title“Heavenly Auxiliary Emperor” was his posthumous title. The honorific title and posthumous title of Emperor Shengzong Yelv Longxv show the phenomenon of cultural mixture between the Han nationality and the minority nationalities，proving Qidan’s emperor was the monarch of Han nation and all ethnic groups in Liao Dynasty, and reflecting the government’s policy that “Ruling the Han nationality with the Han system, ruling the ethnic groups with the ethnic groups system”.

Key words: Liao Dynasty, Yelv Longxv, emperor, the honorific title, the posthumous title