The utility model makes use of the sound absorption function of the silencing material and the sound absorption structure to weaken the noise transmitted along the pipeline within the distance range, so as to achieve the purpose of noise elimination. Common sound-absorbing materials include glass fiber, low-carbon steel wire mesh, felt, etc. The utility model has good noise elimination effect for high frequency noise, but poor low frequency noise elimination performance. In addition, because the sound-absorbing material is easy to be melted by the high-temperature exhaust gas discharged from the engine, its service life is short, and it is easy to reduce or muffle the noise due to the blockage of carbon deposit and sediment, so the single resistive muffler is rarely used for motorcycles. 2. The reactive muffler is a kind of muffler which suddenly expands (or shrinks) or connects with a resonance chamber beside the pipe section to reflect the frequency sound wave propagating in the pipeline to the direction of sound source at the sudden change point, so as to achieve sound elimination. The plate muffler is used to eliminate low frequency noise, but it is not good for high frequency noise. The muffler adopts the sound elimination principle of the resistance muffler and the Resistance Muffler with appropriate structure, so that it has both the sound attenuation characteristics of the two. Aiming at the noise bandwidth of motorcycle engine noise source, the method of noise elimination in low frequency, medium frequency and high frequency range is proposed.