An introduction to the main function and design principal of the hydraulic system for the precast concrete distributor was presented. Based on analyzing the action requirements and functions of the hydraulic system, the composition of the hydraulic system of the precast concrete distributor was put forward.From the view of design specifications and technical parameters,the determination of the hydraulic system parameters, the calculation and selection of hydraulic components were expounded. Improvement was done by simulating the two kinds of the manifold backplanes and studying its pressure loss to find vortices place where was easy to produce. After market verification，this hydraulic system adapts to the situation of frequent ferry in construction site and meets the need of construction.