Abstract: Average current control mode could make phase-shift full bridge dc-dc converter get superior dynamic and static characteristics,but it is difficult to design control parameters for its complicated circuit construction. In the paper, the principle and working process of PS-FB-ZVS converter is expounded in detail, and its small signal model is established, then the average current mode control system’s snall signal mode is build and its transfer function is set up, finally the control parameters are designed. At the end of the paper, simulation and experimental results are given to verify the proposed analysis and design.