The Nineteenth National Congress of the Communist Party of China（CPC）called for improving the party and state supervision system. A sound supervision system is critical to “putting power in the cage of institutions” and “achieving an overwhelming victory over fighting corruption”. Since the Eighteenth Nation Congress of CPC，China has developed a three-dimensional supervision system with Chinese characteristics，which is composed of within-party supervision，congress supervision，state supervision，audit supervision，judiciary supervision，democratic supervision and public-opinion supervision. As power hasn’t been completely limited to the cage of institutions，to achieve this goal still need to strengthen within-party supervision，democratic supervision and public-opinion supervision.