Abstract: In order to advance the study on social order,the practical foundation of the existence of social order should be analyzed from several perspectives,such as growing, expanding in totality and forming.Social order has its practical foundation in the aspect of social philosophy.Practice is the real starting point of the study on the nature of social order. Social order forms in the process of practice and expands on the foundation of practice.For the sake of discovering the nature of its existence,the study on social order should be put into the relationship between man and social order.The subject issue of social order should be understood firstly for the understanding of the relationship between man and social order.