Biogas is produced by the anaerobic digestion of biodegradable materials such as plan material, manure, agriculture waste, sewage, municipal waste. Biogas is considering one of the most important renewable energy, contributions for rural economic development and reducing air pollution. The study of applying biogas for internal combustion engine was carrying out at many research centers in Vietnam. Researchers from Da Nang University concentrated on developing dual fuel diesel-biogas engine, while researchers from Ho Chi Minh city University of Technology focused on conversion diesel engine to fully biogas engine. The main objective of this report was introduced shortly research and development biogas engine and suggestion research direction in order to optimizing the product. Resulting from this paper contributes for the development and application biogas in Vietnam.