Abstract: The outbreak of COVID-19 epidemic has once again become a window for human beings and risks to test themselves respectively. The global epidemic revealed the traits of risk society characterized by unpredictability, organized irresponsibility and difficulty in public consultation. As a kind of actors, facing the ontological uneasiness, differentiated sharing of risks and multidimensional derivative consequences caused by the epidemic, social work can play its professional advantages in cultivating confidence and trust, adhering to the protection orientation and integrating the three attributes. After the temporary victory of epidemic prevention and control, social work needs to examine its professional practice in abnormal context, and then finds that the triple contradictions between "mobile pause key" and network service lag, "derivative of epidemic situation" and insufficient crossing of disciplinary boundary, "abnormal situation" and isolated autonomous service affect the service effect of social work in practice. In the new era of the growth of national and social governance, social work needs to check and fill in the gaps, improve the practical experience in abnormal situations and expand the boundary of service application and achieve discipline consciousness.

Key words: epidemic prevention and control, social work, actors, boundary crossing, absence of service