The utility model provides a training simulator is maintained in ground service based on the trainer aircraft, is the supplementary training screen of scene outside simulation passenger cabin, coach's control cabinet, aircraft system Dynamics principle show screen and 3D cabin, wherein, simulation passenger cabin and coach's control cabinet both way junction, coach's control cabinet is connected with the 3D cabin supplementary training screen diphase of outer scene, and simulation passenger cabin, the outer scene in 3D cabin supplementary train to shield to show to shield with aircraft system Dynamics principle respectively be connected, coach's control cabinet is clothes closet style stage body to it has the touch screen to inlay on the stage body, and the equipment that is used for external input that is provided with on the stage body mesa, the supplementary training screen of scene is provided simulation passenger cabin one side outside the 3D cabin, and aircraft system Dynamics principle show screen is provided simulation passenger cabin opposite side. The utility model discloses an outer scene of simulation under-deck not only reduces real dress by the simulated training and trains and result in the life-span loss and the fuel consumption of equipment, sparingly keeps in repair the training funds, and improve training efficiency effectively.