With the increase of the proportion of new energy, in the Yunnan power grid with abundant hydropower resources, relying on the primary frequency modulation of traditional units can no longer meet the requirements of frequency stability of Yunnan asynchronous networking system. For the power reverse adjustment caused by the water hammer effect of large hydropower, a wind-storage combined frequency modulation control strategy considering load frequency characteristics is proposed. Firstly, the frequency domain model transfer function of traditional power (turbine), doubly-fed wind turbine, energy storage system and comprehensive load is established. Then, the DC power flow method is used to simplify the electric network, and the analytical formula of frequency response of wind-storage node under load disturbance is obtained. The four\|machines system with wind\|stroage, water turbine and lood is built in the electromechanical transient simulation sofware PSD\|BPA. Through the theoretical analysis of the analytical formula and the simulation verification of the four-machine system, the influence of the proportion of static load model and frequency characteristic parameters and the proportion of energy storage on the system frequency is analyzed. The results show that the wind-storage combined frequency modulation considering the load frequency characteristics can effectively reduce the system frequency deviation.