In order to control the noise in the limited space in the field of precision electronic device, porous stainless steel fiber materials, which were the thickness of 2 mm and the porosities of 55% ~ 76%, were prepared by sintering process in the vacuum using the 316L stainless steel fiber with the diameters of 8?m to 20 ?m in the paper. Then the complex structure with the thickness of 3 ~ 4 mm was made using the porous stainless steel fiber materials, the perforated panel and the thin metal plate by sintering process in the vacuum. The sound absorption coefficient and the transmission loss of porous metal fiber materials and the complex structure were tested by the acoustic impedance tube with the type of 4206. The effects of the porosity and the fiber diameter of porous stainless steel fiber materials, the parameters of the perforated panel and the thin metal plate on the sound absorption and sound insulation properties were systematically analyzed. To control the noise, the single complex structure should be used and the sound absorption coefficient is stable about 0.3 to 0.4 when the thickness of porous metal fiber materials is 2 mm. Furthermore, the gradient complex structure should be used and the maximum sound absorption coefficient is about 0.75 when the sound frequency is higher than 3000 Hz. In addition, the sound absorption coefficient of complex structure can be obviously improved by adding the perforated panel in the front of porous metal fiber materials. The effect of punching rate of the perforated panel on the sound absorption coefficient of the complex structure is higher than that of the pore size of the perforated panel. The first resonance frequency of complex structure moves to the lower frequency direction and the sound absorption frequency range widens at the adjacent resonance frequency compared with the perforated panel. Additionally, the sound absorption coefficient of gradient porous metal fiber materials also can be improved by adding the thin metal plate at the interface between single porous metal fiber materials.