Abstract: It is of great significance to study the system frequency response characteristics of the modular multilevel converter based multi-terminal direct current（MMC-MTDC） transmission system integrated with wind farms. However, the time-domain simulation modeling process is complicated and is not suitable for theoretical analysis. Thus, it is urgent to develop a complete dynamic characteristic analysis model of frequency, active power and DC voltage for wind farms and the MMC-MTDC system.Therefore, taking advantage of the decoupling characteristics of the AC and DC sides in the average model of MMC, the AC side of the grid side converter（GSC） and the generators are independently modeled. Considering the losses of back-to-back converters,AC collection lines and the wind farm converter（WFC）, the intermediated links of direct-drive wind turbine and WFC are simplified according to the power transfer law. Based on the equivalent models of the GSC and WFC, the DC lines are used as the interactive ports, and the small-signal model of active components of the MMC-MTDC system integrated with wind farms is established by the modular modeling method. The simulation results show that the general frequency response model can accurately simulate the dynamic process after the small frequency disturbance, and can be used for stability analysis, which provides a reference for parameter tuning of the control system.