Abstract:Lao Tzu has no monograph on the concept of time, but Lao Tzus philosophy includes his view on the Time, called Lao Tzus Philosophy of Time. Lao Tzus concept of time is the most prominent characteristics of concept of cycle time. This paper discusses the basic connotation and ideological origin of Lao Tzus concept of time, his thought of “ens” and “zero” and the Daoism that expresses the essence of this concept, and Lao Tzus study on the evolution of morality that shows his view on the development process of thing. These studies will help us to understand Lao Tzus scientific concept of time as well as the modern concept of time.