Wu Xin Lun by Chan Zong is undoubtedly an article about Buddhism philosophical connotation. However, naming it as "Wu Xin" is very likely for people to associate it with the Taoism connotation of Wu Xin, or to think its interpretation of Buddhism is only frozen at the phase of Analogical interpretation that mixes Buddhism and Taoism into one. The main purpose of this article serves to indicate the similarities and differences between the two doctrines, and to allocate the term "Wu Xin" to respectively appropriate interpretation in different domain. This article will compare the Gongfu approach and ultimate object of Buddhism and Taoism under the principle of "Yi Zong Qi Jiao Yi Jiao Ding Zong". In the view of Gongfu approach, in both Buddhism and Taoism, the term "Wu Xin" contains the meaning of eliminating dedication, until reaching the state of no dedication and physiognomy, and no recognition of self and Teaching. This is the similarity of the interpretation in the Teaching approach between both Buddhism and Taoism. In Buddhism, the ultimate state of Wu Xin completes the theory of Nie Pan; in Taoism, the sublime realm of "Do Nothing and Do Everything". The most significant difference between the two doctrines is that Buddhism confirms on all existence of object, which is not limited to any form, upon the basic idea of "Dependent Arising and Emptiness"; if there is confirmation, they are based on the saying of Uncertain Birth and Death, which originates from the theory of "Non-Substantiality". On the other hand, Toaism suggests that objects are created as the way they are; the Self Cultivation of Internal and External is to let the natural characters of all object be themselves and be carried out. The interpretation of "Wu Xin" has to stick to the philosophical connotation of the both doctrines; otherwise there will be confusion and ambiguity. If the term "Wu Xin" is interpreted with its ultimate objective, its approach and connotation should be direct and clear.