With the change of urban economic structure and social structure since Reform and Opening, the function and administrative scope of sub - district office expand rapidly that have exceeded the regulation of politic and legal system. This paper reviews historical changes of sub - district office and analyzes dilemmas of its governance. On this basis, we suggest the root of governance dilemma be the uncertainty of actual property and function of sub - district office. At the end, from the point of view of defining responsibility scientifically and reasonably, we put ...