The aerodynamic noise generated by the flow around a bluff body can be reduced by covering the surface of the object with soft porous materials. In order to verify the effectiveness of this method, aeroacoustic measurement experiments were carried out in the D5 aeroacoustic wind tunnel of Beihang University, covering the surface of cylinders with different soft porous materials under different wind speeds. The results show that the aerodynamic noise generated by the cylinder can be reduced by covering the surface of the cylinder with soft materials. The flow field results show that the soft materials prolong the wake of the cylinder and inhibit the vortex shedding at the rear edge of the cylinder.