The thermal hazard of organic peroxides should be assessed to predict and avoid runaway decomposition.In this paper，the Setaram C80 was used to investigate thermal decomposition of several organic peroxides such as cumene hydroperoxide(CHP)，tert-butyl hydroperoxide(TBHP)，dicumyl peroxide(DCP)，di-tert-butyl peroxide(DTBP)，benzoyl peroxide(BPO)，tert-butyl peroxybenzoate(TBPB)，methyl ethyl ketone peroxide(MEKP)，2

5-dimethyl-2

5-di(tert-butylperoxy)hexane(DHBP)and 1

1-di-(tert-butylperoxy)-3

3

5-trimethylcyclohexane(TMCH).Decomposition heat of the organic peroxides was calculated from isothermal scanning curves.The nth-order or autocatalytic reaction kinetics model was established for these organic peroxides，and self accelerating decomposition temperature(SADT)was derived by using Semenov model.The results showed that decomposition of the organic peroxides mostly followed nth-order model with approximate reaction order of 1，however，some of them preferred to autocatalytic model.The SADT of the organic peroxides calculated was in good agreement with values from literatures，demonstrating reaction kinetics fitting and SADT calculating in this paper are of scientific.