The article introduces the development background of VMS, and then explains inevitable trends that utility systems and avionics systems will be well integrated. Unborn AEW will be a integrate platform equipped with detectors, command and control facilities, communications, navigational instruments etc. According to the future requirements, basic functions of VMS used for AEW is discussed. Application of integrated system control structure principle, the functional structure related to the VMS of AEW is divided into three levels: sense, auxiliary decision-making and execution. All of this can provide references for the designation for VMS of AEW.