The institutional setup in procuratorates has two goals: one is to improve efficiency through division of functions; the other one is for better direction and supervision by procuratorates at higher levels. In institutional setup, factors such as judicial accountability, amount of cases and number of prosecutors, quality of work, daily management and coordination between different levels of procuratorates should be considered. In addition, we need to pay attention to the stability and uniformity of institutions. The“giant department”reform suits procuratorates which have small amount of cases and less prosecutors, especially those of the lowest level. The separation of prosecution from is better form implementation of supervision, but actually it's hard to completely separate the two functions. Moreover, after the transfer of investigative power, the supervisory function needs to be supported by the power of arrest approval and the power of prosecution. The combination of arrest approval department and the prosecution department can streamline institutions and improve efficiency, and strengthen the direction and supervision on investigation. However, since arrest approval and prosecution have different qualities, the combination of the two departments will break the balance between different departments. Except in juvenile cases, we should be cautious in the combination of arrest approval and prosecution in other cases. The internal institutional setup of procuratorates should be adjusted according to the reform of our national supervisory organs.