3 Kinds of coal dust sample which were obtained from different region and rank were detected by chemiluminescence (CL) in the environmet of increasing oxygen. Except one group

the results showed that there are remarkable or very remarkable difference on the emission peak value and average value between groups of sample and group of control and so do groups of sample one another. The CL of coal dust samples were affected significantly by grinding on sample and density of oxygen. The mechanism of CL of coal dust was discussed.