Kinetics of oil shale pyrolysis was studied by differential scanning calorimetry and non-isothemal thermogravimetry. In nitrogen atmosphere two different mechanisms causing mass loss were observed: distillation in the region between ambient temperature and 500 K, visbreaking and cracking in the region of 500-800 K. Kinetic parameters of the sample pyrolysis are determined using different kinetic models, and the results are discussed.