Research on the regulation of PPP project operation Research on the regulation and rule of real property registration research on the sex ratio at birth of the minority population research on the legislation of network platform management research on the decoration of Yixing Zisha teapots research on the perspective of population aging research on the innovation of Hu Dabai's educational practice research on the legal regulation with responsible government research on the innovation of the parallel system of position and rank research from the perspective of population behavior