Social work involved in social assistance，using the knowledge and methods of social work professional concept，helps social assistance object to understand their own needs，relieves the psychological pressure，enhances the development ability，strengthens the social function，and improve the living environment of professional services. It is a necessary requirement to achieve important means of social governance and the construction of modern social assistance system. This article unifies Shanghai social work involved in social assistance work in practice to explore the innovative ideas and methods of social assistance，to support mechanism of social work and social workers to widely participate in social assistance，and to establish a new social assistance model，construct modern social assistance system.