Abstract Taoism, created by Lao Tsu, is one of constituents of traditional Chinese culture. To understand it should begin with the full comprehension of categories of doctrines of tao , wu, zi ran and wu wei. The term tao has rich meaning. The term wu（literally nothingness）, though also rich in its meaning, is primarily interpreted within the philosophical framework as existence and infinity rather than nothingness and non-existence, which embody its infinity and irregularity. The term wu is the existing way of tao. Thus, tao means infinity, oneness and essence while de does existence, ubiquity and function. Accordingly, the Lao Tsu’s Tao Te Ching also can be called as the Scripture of wu and You（infinity and existence）, the Scripture of yi and Duo（oneness and ubiquity）,and the Scripture of ti and Yong （essence and function）. Furthermore, the term of tao te with the above meanings is enhanced under the category of zi ran（nature） and wu wei（inaction）. Only by understanding the two categories at different levels can we unveil their rich content and significance.
Keywords Taoism. Lao Tsu. Tao. Wu. Zi Ran. Wu Wei.