Generally the parameters, determined in the design of air distribution devicefor pneumatic equipment,are difficult.to conform with the practical operating conditionscompletely.Therefore, it is necessary to test the designed prototype,draw up its curvesrelatie to the performance,compare,the actural parameters of working state with the de-eign parametera,analyze the differences between the two kinds of parameters and seek thecause,then adjust and inodjfy some structure sizes and locations,so that the designer con-cepr is unified with the practice.