Abstract: With the ongoing development from the water treatment to water security management, the studies on urban water security have shifted their perspectives from the field of natural science to the field of social humanity. However, both the domestic and overseas studies still remain at a stage of practical exploration and experience sharing, and a complete, distinct conceptual and theoretical system has not been formed yet. To this end, this paper is intended to build its theoretical system that incorporates the studies on urban water security into the scope of non-traditional security. The first step begins with the original meaning of security to discuss the disciplinary affiliation of the urban water security, followed by the interpretation on its subject relationship from the inter-subjectivity and the analysis of the dynamic process of securing urban water from the angle of safe physical and social construction. Also, the general framework built upon the non-traditional security theory is used to destruct the designated objects and their security values related to the urban water security. All contributes to a conclusion of the concept of urban water security, providing a new thinking direction for studies on the urban water security in which both the nature and humanity are taken into account.