Reconstruction and improvment of China's grain reserve system 并列题名：Reconstruction and improvment of China's grain reserve system Research on reform and improvement of China's regular sampling survey system Construction and development of a multi-tiered health care security system Study on the stabilization and improvement of the basic rural operation system 其他题名：Construction and development of a multi-tiered health care security system Reconstructing images of Chinese peasantry Research on major issues in the integration and improvements of China's social security system Construction of Chinese discourse system Reconstruction of enterprise remuneration system