In this paper， an optimized wind power dispatching method is proposed to improve the power grid's acceptable wind power capacity based on the current network structure and power source construction. In the method proposed， the normal generator sets are arranged based on the wind power prediction， the load forecast and the interconnection tie plan， so the space for the wind power is reserved in advance. The secure area for the wind power plant's active power is determined considering security constraints of the power grid. Then the safety area sequence of wind power plants is decided by the area stability sensibility v.s. the active power. Thus， the wind power can be accepted as more as possible.This method is verified by the operation data.