Taking a new vane plunger composite type of two-stage variable vane pump as research subject,its key characteristic is to reduce high-speed vane impact by embedding the top of the vane into the stator and rotating the rotor,vane and stator simultaneously.The instantaneous flow characteristics equation of the pump under the compound action of vane plunger was derived.A proportional solenoid valve model,an instantaneous flow model,a variable mechanism model,were built.The characteristics of the two-stage variable vane pump were simulated based on AMESim simulation platform.The relevant verification was carried out by bench test.The experimental results show that the pressure-flow curve of the pump matches well at medium and low speeds,indicating accurate modeling of flow and variable displacement;the acceleration and deceleration curves indicate that the pressure regulation of the pump is stable under different duty cycles of the proportional valve.