Research on operating regulation of social security fund in China 并列题名:Research on operating regulation of social security fund in China Research on legal issues of social security fund trust Research on financing mechanism reform of social security in China Research on risk management of social security fund Research on rural social security in China research on the regional disparity of social security and its fiscal transfer Resarch on regulation of governmental special funds in China 并列题名:Research on financing mechanism reform of social security in China research on functions of political social associations in China