In order to discuss the thermal evolution features of coal bed gas through the hydrous thermal simulation experiments of the selected Jurassic coal samples of Qiadam Basin,the authors analyzed the evolution characteristics of liquid oil and gas production.The experimental results indicated that gaseous hydrocarbons were generated in thermal evolution stages and liquid oil was produced in oil window range and had a lower yield. At the oil-generating peak, the methane relative content is lower,a little higher before, and rising rapidly after the peak. Heavy hydrocarbon gas relative content is higher at oil-generating stage and early high mature stage and decrease later. In nonhydrocarbons, the carbon dioxide relative content is clearly higher than nitrogen忆s and is mainly generated at the stage of liquid oil formation. The hydrogen gas relative content is higher, and first increases and then decreases with temperature rising and its minimum value appears after oil-generating peak. The Jurassic coal sample overall has high methane yield,much more than the measured gas content of general coal, and functions as the foundation for the coal-derived gas generation and conventional reservoir gas.