Abstract: To explore the influencing factors of errors in the measurement of methane content by the optical interference methane detector (light wave), field tests were conducted at the return air corner of the A3015 working face, the return air of the working face, and the sealed area of the A3009 transportation roadway in the mine, and the analysis was carried out in combination with laboratory simulation experiments. On-site, six optical interference methane detectors from different manufacturers were compared and tested with portable methane detection alarm instruments, laser principle methane sensors and gas chromatographs. Through group comparison, gas sample analysis and other methods, the influence of environmental parameters, gas composition and adsorbents on the measured values of the optical tiles was studied. The results show that the measured values of the light tile are generally high and deviate significantly from those of the other three instruments. Environmental parameters such as temperature and air pressure have no significant influence on the measured values. A decrease in oxygen concentration will increase the error, while an increase in carbon dioxide concentration and a decline in the effectiveness of the adsorbent will significantly increase the error. The influence of carbon monoxide can be ignored. The presence or absence of adsorbents, particle size, dosage and loss state have a significant impact on the results. The conclusion shows that the measurement error of the light tile is mainly affected by the concentrations of CO₂ and O₂ and the adsorbent. The main controlling factor of the corner on the working face of A3015 is the oxygen concentration, and the goaf in the transport roadway of A3009 is the combined factor of oxygen and carbon dioxide.