Abstract: A slip decoupling control scheme of the brushless doubly-fed machine (BDFM) in double synchronous coordinates is proposed to overcome the shortcomings of the decoupling control and the overall performance analysis of BDFM, the necessary condition of the control is analyzed. Secondly, the load characteristics of the BDFM under the closed-loop control are obtained by solving the static equations in double synchronous coordinates. When the motor speed and the control motor flux are fixed, the load boundary of the motor can be solved. Finally, the decoupling performance and dynamic performance of the proposed control scheme are verified by simulation and experiment, and the correctness and validity of the load performance analysis are also verified.