The basic theory should be strengthened when social work develops from major to subject. Forming a basic theory with social work characteristics should not only have the experience basis of relevant social and historical conditions but also have a clear research level and multiple self-consistent analysis tools. The construction of general basic theory is related to the trend of social development with significant influence and dominant social conditions in certain period. The theoretical research of social work has the dual characteristics of explanation and change. The core work of the research is to construct general basic theory with local characteristics in macro，middle and micro level. The action system theory plays a real core status of guideline in the theoretical paradigm of various social action studies. The two-dimensional structure of social work values is the analytical tool of the basic practical mode. The problem of localization of social work，whether it is in macro level or micro level，is the double structure problem of social work value and ideological.