Study on the illegality of paper work and prevention in Song Dynasty 并列题名：Study on the illegality of paper work and prevention in Song Dynasty Study on the state and local society in song dynasty study on literati from imperial examination in Qing dynasty Study on the idealogy of vinaya in Ming and Qing dynasty Study on the modernity of travels in the Late Qing dynasty Study on the land tax system and related problems in Song dynasty Study on the legalization of ethnic policies in the Qing dynasty a study on the region of Sanhe in Qin and Han dynasty a study on the interaction between folk songs and politics in the Han dynasty