In this paper, we analyze the borrow of the word "chongxuan" which is original from "profound and more profound, it is all gates of the occult" in Daodejing from the Dongjin dynasty to the Sui and Tang dynasty.

This text thinks that the connotation of "duplicate metaphysics" is, not only eliminating the existence and nothing, but also eliminating the elimination.

With respect to "Dao De Zhen jing Guang sheng yi" representing Du Guangting s Taoism philosophy and the Taoist theoretical level, the thesis is intended to study Du Guangting s great aspiration to summarize duplicate metaphysics, his academic method and objective.

A Preliminary Study of Du Guangting s Thinking of Chongxuanxue;

Cheng Xuanying, the theoretical representative of Chongxuanxue, explored deeply the doctrine and constructed the spiritual creation as the unity of both the positive and the negative method, which has now the key and colorful part of the Chongxuanxue.

Haikongzhizangjing (the full name is Taishangyichenghaikongzhizangjing ) is an important volume of Chongxuanxue of Taoism in the early period of Tang Dynasty.

The Aesthetics of Two-Fold-Mystery of Cheng Xuanying constr ucts the cumstance of Two-Fold-Mystery,which makes up for the deficiency in the aesthetic thoughts of Taoist school .