A model support and adjustment combined design method relates to a mini straight-flow wind tunnel. A model support and adjustment integrated device is arranged, and provided with an experimental model, an adjusting plate, a wing-shaped support rod, a lower support rod, an adjusting disc, a haulage rope, an adjusting pin and a support pedestal. The method is applied to mini wind tunnel for teachingexperiments, a reliable and stable air flow environment in the test section can be realized, flow parameters can be measured more accurately, a research object is arranged in the uniform air flow ofthe test section of the wind tunnel via a stable support system which has less influence on flow of the model itself, and the model attitude can be changed conveniently according to test requirements.