The gas hydrates was discovered in the coal and shale of the Jurassic coal measures in the Muli coalfield, and the gas sources were coal and shale. The Permafrost in Tibetan plateau provides cap-rock for gas hydrate. Based on the study of forming condition and characteristics of gas hydrates, we have proposed a model of gas hydrates accumulation; fault plays a role of migration system, disconformity acts as migration system, well-permeable sandstones act as migration and reservoir system.