Abstract: Improving the oscillation energy transfer efficiency of grid-forming wind turbines is the key to solving the parameter design contradiction between oscillation suppression and frequency support, which plays an important role in the engineering application of grid-forming control technology. First, this paper analyzes the rotor angle elastic coupling relationship between a synchronous generator and a grid-forming doubly-fed wind turbine, and constructs a two-degree-of-freedom system elastic motion model with grid-forming wind power. Then, based on the Hamiltonian energy function method, the transfer mechanism of oscillation energy between the grid-forming wind turbine and the synchronous generator is analyzed, and the necessary condition for improving the oscillation energy transfer efficiency of the grid-forming wind turbine is analyzed. The active support control strategy of the grid-forming wind turbine power based on the efficient transfer of oscillation energy is proposed. Finally, a simulation system with high proportion of wind power is constructed, indicating that the proposed control method can significantly improve the suppression effect of doubly-fed wind turbines on system power oscillation and frequency fluctuation.