Abstract: To reduce detection errors,a real-time humidity correction technology for dust mass concentration detection was proposed. By analyzing the Mie scattering theory and studying the multi-angle light scattering theory,a mathematical theoretical model for real-time humidity correction dust mass concentration detection was established,and a multi-angle light scattering dust mass concentration detection unit was developed. The characteristics of moisture absorption growth of coal dust particles were analyzed. The relationship between environmental humidity, dust particle size, and scattered luminous flux was experimentally studied. The detection technology of dust mass concentration with multi-angle light scattering humidity correction was proposed. The humidity correction factor algorithm was written into the multi-angle light scattering dust mass concentration detection unit. It is found that the detection error of the multi-angle light scattering dust mass concentration detection unit with humidity correction ξ is ≤ 10. 6%,which is 3. 3% smaller than that without humidity correction.