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With the startup and execution of new socialistic countryside construction in Heilongjiang Province, the transition from castoff to resource is strengthened in the countryside, aiming at neat appearance of the countryside, clean production and saving energy. People produce biogas and provide the countryside with new energy by means of turning livestocks dejection into resources, composting of the plant and animals leavings in the courtyard and even in the factory. It is helpful for the countryside to conserve the energy and reduce emission of the waste. And it also plays an important role in protecting the eco-environment, beautifying homestead and developing the ecological agriculture and so on. The liquid and solid residue in the biogas production can be reused as fertilizer for crops or food for animals afier pretreatment, which is propitious to accelerate the development of the circular economy in Heilongjiang Province.