As a novel multi-functional power electronic device, the soft open point (SOP) can not only optimize the power flow in the distribution network, but also optimize the voltage distribution. In this paper, the mathematical model of SOP is first derived, and then, aims at the shortcomings of the PI parameters of traditional multi-port SOP double-loop control with many PI parameters and the difficulty of setting, the deadbeat control is used to design the current inner loop, thereby reducing the number of PI controllers and simplifying the design of the control circuit. Aiming at the disadvantages of deadbeat control being more sensitive to filter inductance and poor anti-inductance parameter perturbation capability, a parameter identification link is added to track and estimate system parameters to improve the robustness of deadbeat control. Then, based on deadbeat control with parameter identification, the UdcQ, PQ and Uacf control modes of each port are algorithmically implemented. The, simulation experiments in MATLAB/Simulink verify the feasibility of the proposed control algorithm.