This paper constructs a three-terminal system connecting wind farm based VSC-MTDC. DC response have the advantages of strong and fast controllability, VSC-HVDC have the characteristics of control active power and reactive power independently and quickly.Therefore, a coordinated control method of VSC-HVDC and governor is presented in this paper, in virtue of setting additional frequency control in the constant active power controller to improve AC system frequency stability.Theoretical analysis and simulation results show that the proposed control strategy can improve the frequency adjustment ability of multi-terminal HVDC system,it can effectively improve the system frequency stability when the system is disturbed.