In the main structure of social assistance system of China, the government is a first subjectivity for the responsibility, however, the financial resources of the government is limited, there are many blind points in governmental social assistance, as a result, there are many social members who are out of the governmental assistance insurance network. Based on the situation of China such as large population and economic backwardness, the responsibility for helping social groups in difficulty should not be only taken by the government, other social forces should play a role in social assistance, so that the social mechanism for social assistance can be gradually transformed from governmental taking all responsibilities to the responsibility for social assistance being taken by both government and non-governmental organizations.