The Central Government take the “administration streamlining and institute decentralization” as an important measure to release the reform bonus and build an upgraded version of Chinas economy. The implementation of the policy is directly related to the success of comprehensive deepening reform. Based on the clarification of the logic of the political reform, this paper not only makes an analysis on the games of interests and difficulties in the implementation of the policy, but also makes an exploration on the governance function and the optimized path in the implementation of the decentralization policy. The national audit should take the initiative to adapt to the requirements of the modern governance capability, supervises the implementation of policies and ensure the solid progress of the comprehensive deepening reform.