According to large-scale wind power integration, a transient power angle stability analysis method considering wind power is proposed theoretically. The impedance model is used to simplify the fan, mixing the active and reactive power information of wind power into the admittance matrix of the system. Through analyzing the rotor motion of synchronous machines(SMs), it can be seen that wind power integration influence both mechanical power and electromagnetic power of SMs under replacement conditions. Finally, through theoretical calculation and simulation verification of multi-machine small-scale system, it is concluded that in the process of increasing the proportion of wind power at the supply end, the change of transient acceleration area is the dominant factor of power angle stability in the early stage, while deceleration area in the later stage.