Study on the banishment system in Qing dynasty Study on the tributes and its system in Qing dynasty Study on the penalty of atonement system in Ming Dynasty Study on the tax legal system in the Qing Dynasty Study on the marching system of the Tang Dynasty Study on the noble titles system of Jin Dynasty Study on the four-ritual system in the Song Dynasty Research on the court defense system in Tang dynasty Study on the silk in the Ming dynasty Study of the imperial examination system in the Tang dynasty