Abstract: With the fast development of biogas industry in China，how to use the biogas to achieve greater economic benefits is one of key factors affecting development model shift of middle and large scale biogas plants from environment protection mode to energy generation mode.The usage of biogas is changing from fueling combined heat and power generator engines to upgrading biogas to bio-methane.Biogas purification and upgrading is one of the high value applications of biogas.Bio-methane can be used as compressed natural gas and vehicle fuel.This paper summarizes the development of biogas purification industry at home and abroad.The technologies for removal of hydrogen sulfide and carbon dioxide are also reviewed.