Abstract: In order to figure out local fan noise propagation laws in different surface roughness straight excavating roadway, we adopt FBYNo3.0/2.2 (II) pushed mining flame-proof type axial flow local ventilator as noise source, setting up straight pipe noise propagation experiment device, we carry out noise transmission simulation experiments for several kinds of condition within different roadway of surface roughness. It turns out that in the process of noise transmission, the sound intensity noise and noise frequency present inverted "V" glyph, from the combined impact of rough pipe damping effect and diffusion effect, the noise sound intensity decreased with the increase of length to diameter ratio of pipe gradually; for different roughness of roadway inner wall, the more the roughness, the faster the noise in the process of transmission attenuation rate. In the same roughness of roadway, low frequency and high frequency noise attenuation rate is higher than medium frequency noise attenuation rate.