Abstract: The pyrolysis behavior of oil shale semi-coke was studied with the thermogravimetic analyzer.Retorting temperature of 500—600℃ was recommended after quality of shale oil, content and calorific value of semi-coke and design of circulating fluidized bed were comprehensively considered.Retorting degree influenced the start temperature of mass loss and pyrolysis process at low-temperature stage, but had little effect on pyrolysis at high-temperature stage.Pyrolysis process of fuel semi-coke made at a higher distillation temperature could be seen in that of fuel semi-coke made at a lower distillation temperature. Pyrolysis degree of semi-coke would decrease at the same temperature with heat-up rate increasing.However, pyrolysis process of semi-coke would hardly be affected by heat-up rate after heat-up rate was above 40℃•min^-1.Pyrolysis kinetic parameters of semi-coke were calculated with the Coasts method and the results might be referred to in simulation calculation and engineering design.