The results of a study to determine the kinetics of combustion of oil shale and its char by using differential thermal analysis are reported. The study indicates that Colorado oil shale and its char combustion rate is the fastest while Fushun oil shale and its char combustion rate is the slowest among the six oil shales used in this work. Oil shale samples used were Fushun oil shale, Maoming oil shale, Huang county oil shale, and Colorado oil shale.