In order to overcome the limitations of conventional control methods, such as insufficient current-sharing accuracy, narrow system bandwidth, and restricted dynamic response. This paper proposes a parallel current-mode control strategy and applies it to DC-DC converters. Unlike traditional dual-loop control, the duty cycle signal in this strategy is generated by combining voltage and current components derived in the discrete domain. This approach not only effectively handles load current disturbances and input voltage perturbations but also facilitates digital implementation. By modeling the main circuit and control circuit of the DC-DC converter, a comprehensive small-signal model of the system is established. The closed-loop transfer function is analyzed in detail, and the design procedure of the controller is systematically outlined based on this model. Simulations analysis demonstrates the feasibility of the proposed method, showing significantly enhanced dynamic performance compared to conventional peak current-mode control strategies.