Abstract: Aiming at defects of "high concentrations of poisoning", zero drift, slow response times, the short life affected by the high temperature and humidity and other gases, under the premise of the growing maturity of the near-infrared spectral control technology, this paper presents a laser methane sensor based on spectral absorption principle. The laser methane sensor can timely and accurate detect methane gas source, concentration, which has a very important significance for coal mine safety production.