Abstract: In order to detect the wind resistance of the tent structure,it was necessary to establish the corresponding blowing test system.3-D air-velocity field of propeller fans in the blowing test system was simulated,based on the standard turbulence model.The characteristics of air-velocity field of single fan and double fans under different axis spacing was analyzed.The results showed that the velocity peak of air-velocity field of single fan was located in the fan axis,and the wind velocity decreased gradually along the flow direction.Distribution of the air-velocity field of double fans was symmetrical,and the superimposed area of air-velocity increased gradually along the flow direction.In the areas that were farther away from the fan outlet,the wind velocity distribution was more uniform.In the area encircled with the planes that were through the axis of fans,the wind velocity increased gradually along the flow direction,while it begins to decline at the distance of 13m~15m.The air-velocity distribution of double fans was more evenly in the rectangular region of 4m×7m on the plane located 12.2m from fans,and the average wind velocity was higher than 20m/s.When the axis spacing was 4m,the wind speed at the corner of rectangular region of 4m×7m was larger.