Abstract: In order to improve the the dynamic characteristics of the hybrid power bi-directional DC/DC converter in the working process, a kind of R-S-T control strategy used for three-channel staggered parallel bidirectional Buck/Boost converter is presented.The working process in the Buck mode is analysised and alternating Current small signal model is established.The controller corresponds to buck working mode is designed and the paramete is adjusted.Compared with the traditional control of PI control, the R-S-T control strategy has better dynamic response characteristics and steady state response characteristics.At last, through simulation and experiment verified the correctness and feasibility of this scheme.