Abstract: This paper points out that the urban region studied by urban geography has three types. Urban regional system is a synthesis that is composed of geography factors forming the urban region. And it is an organic entirety with different function in the region and complicated structure that is formed by the promotion of productivity and urbanization. The system is an urban function regional one formed by the differentiation and combination of urban region. And the urban regional system is developing, changing, differentiating and integrating all the time. The reasonable urban regional system must have the comparable and functional feature, and the urban statistic must be true. The foreign geographers have studied the foundation of urban regional system for a long period of time. This paper analyses the American Standard Metropolitan Area (SMA) Theory and the Japanese Densely Inhabited District (DID) Theory that are representative and ripe. All these theories can be used by China to reconstruct the urban regional system for reference at the aspect of theory and method. Comparing with foreign study, China has attempted for many times at the aspect of foundation of urban regional system. But some problems of concepts and methods still exist. After the analysis of theory and method about the construction of the pertinent urban region system at home and abroad, the paper points out the subsistent problems in the define of urban region system in China. On the base of analysis of necessity of reconstruction of Chinese urban regional system, this paper puts forward the idea of reconstruction based on daily life circle and defines the concept of daily life circle. From the point of view of inhabitant's individual life, daily life circle is the spatial area that the daily activities of urban inhabitant involves such as inhabitation, work, education, shopping, medical treatment, entertainment and commuting. The daily life circle is a material urbanization region of a city, and it is the spatial shape and structure system that is formed through urban inhabitant fulfills all kinds of activities in the material urban regional system. It is a functional urban regional system including three circles-essential life circle, basic life circle and opportunity life circle. The essential life circle corresponds to the built-up area of city. The basic life circle corresponds to the linking part of town and country. The opportunity life circle corresponds to outskirts of city. The reconstruction uses the method of raster technique. This method realizes that basic spatial unit of urban regional system based on daily life circle can't be confined by the urban district borderline, and can describe the urban developing level objectively. In the last part, the paper discusses the feasibility of construction of Chinese urban regional system based on daily life circle elementarily. The idea of daily life circle can be used to study Chinese urban developing rules from the point of microcosmic view. And it can also provide a new thinking method to frame and accomplish urban planning and management. The idea of daily life circle has important theoretical and practical meaning for the theoretical study and the practice of urban planning for Chinese urban problems.