The Huayan Jing Xuantan Jueze Ji written by Xianyan , a monk of Huayan Sect in Liao Dynasty , is the only known and well-preserved Liao Dynasty Buddhism writing with the theme of Huayan Studies. This paper selects the Xianyan's Huayan thought in Liao Dynasty as the research topic, through the interpretation and analysis of the text of Huayan Jing Xuantan Jueze Ji, investigates the theoretical face of the Xianyan's Huayan thought, and understands the internal development relationship between the Huayan thought of Liao Dynasty and the Huayan thought of Tang Dynasty, so as to have a more comprehensive understanding of the Xianyan's Huayan thought and Huayan teaching. This paper consists of seven chapters, the first chapter is the introduction, the second to sixth chapters are the main text, and the seventh chapter is the conclusion. In the main text, the second chapter focuses on Xianyan and Huayan Jing Xuantan Jueze Ji, which mainly introduces the general situation of Buddhism in Liao Dynasty, especially Xianyan's life deeds and achievements, as well as the basic explanation of the relevant situation of Huayan Jing Xuantan Jueze Ji; the third chapter explains how Xianyan applied the paradigm of five religions of Huayan Sect, it focuses on the communication of Huayan Sect's five religious judgment, and then expounds the problems of material selection of Xianyan's five religions respectively; the fourth chapter explains the interpretation of Huayan Sect core ideas of """"One Mind"""" and """"Dharma Realm"""", expounds the main views of Huayan ancestors in Tang Dynasty, and then explains Xianyan's specific understanding of relevant issues; the fifth chapter explains the interpretation of Huayan Sect core ideas of """"Lishi"""" and """"Shixuan"""", first around Xianyan's view of """"Lishi"""", and then around Xianyan's """"Shixuan"""" teaching; the sixth chapter explains the relationship between Xianyan's Huayan thought and the thoughts of various Sects, which are mainly reflected in three aspects: the first is the absorption and transformation of Tiantai Sect thought, the second is the quotation and exertion of Faxiang Sect thought, the third is the criticism of Zen practice and the discrimination of Zen Buddhism. This paper focuses on the three aspects of Huayan Sect's religious judgment theory, core thought and integration theory to elaborate multiple features of Xianyan's Huayan thought shown in the Huayan Jing Xuantan Jueze Ji, and draws four conclusions: firstly, the development of Huayan studies in Liao Dynasty is the continuation of Huayan studies in Tang Dynasty, and Xianyan comprehensively inherited the Huayan studies in mid and late Tang Dynasty represented by Chengguan and Zongmi; secondly, the innovation of the doctrine of Xianyan's Huayan thought is prominently reflected in three aspects, his ten meanings to explain the sutra title of Huayan Sutra, the application of the paradigm of five religions of Huayan Sect, and the absorption and transformation of the various Sect’s thoughts; thirdly, Xianyan takes the promotion of the doctrine of Chengguan as its purport, and attaches great importance to the main positi
