By comparing the one dimensional simulation results of the evaporator refrigeration capacity, ventilation resistance and evaporator internal resistance with the experimental values, it is found that the KewCornwell heat exchange correlation in the two phase heat exchange zone of the refrigerant side, the DitusBoeleter heat transfer correlation in the superheated area, and the Dong Junqi model in the air side are appropriate. The error is controlled within 5%. The influence of the opening angle of blinds, the spacing of fins and the height of fins, the width of the tube, the number of channels and the number of flat tubes in each process of evaporator on the performance of the evaporator are studied. According to the above analysis, the structure of the evaporator is optimized. Finally, a scheme with the best comprehensive performance is selected, which makes the ventilation resistance drop by 19%, the internal resistance of the evaporator drop by 8.4%, and the refrigeration capacity is increased by 130 W.