One of salient characteristics of Xunzi’s socio-political theory can be observed in its comprehensiveness. This article aims to elucidate such an aspect of Xunzi’s thought by means of analyzing a possible influential relationship between the Guanzi’s concept of li (i.e., ritual and social norm) and that in the Xunzi. This article analyzes a unique role of the concept of li in the argument of the “Lord and Minsters I” and “Lord and Minsters II” chapters. On this basis, this article attempts to demonstrate that the following three points: (1) In the Guanzi, the concept of li has become a certain level of abstract idea which can be almost equivalent to the idea of the Way or the Principle. (2) In the discussion about the mind/heart practice to govern a country, the author regards li as a practicable and one of the best methods for a ruler to attain ideal psychological state. (3) By means of adopting a state-body metaphor, the author of the “Lord and Minsters I” and “Lord and Minsters II” chapters argues that the proper implementation of li invests a country with its “life.” In this aspect, the function of li is conceived of as “miraculous” as we see in the providential work of the Heaven and Earth. It is this aspect that Xunzi has learnt from the Guanzi when he has articulated his theory of li, which is indispensable for the peace and order, namely the life, of a country.