Abstract: Xuanzong of the Ming Dynasty is a quite as feudal emperors, historians have always spoke very highly of him. During his reign, implemented benevolent rule by law, and appointed excellent talents, cherished the people, paid attention to agricultural production, made the country more powerful, to achieve significant "Ren Xuan governance".However, his administration is not without drawbacks. Because Xuanzong promoted the eunuch, believed in Buddhism excessivly, indulged in the court entertainment etc. Not only gave eunuch monopolizing potential problems in the late Ming Dynasty, but spent a lot of manpower and material resources, to accelerate the historical process of the Ming Dynasty from prosperity to decline.