Social worker refers to Social Work, which is translated from English Social Work. Refers to non-profit professional activities that serve others and society. In the international community, such activities are also called social services or social welfare services. Because different countries and regions have different economic and social structures, different specific problems and different methods to solve problems, people have different expressions on the connotation of social work. International Federation of Social Workers (IFSW) conducted a global survey in 1990s, and found that different countries have similar definitions of social work. We can say that social work is a professional activity to help people or groups in trouble out of trouble under the framework of a certain social welfare system in accordance with professional values and professional methods.