(1) In terms of reliability, the system components (or modules) of marine diesel engine will have a higher level of development, especially the reliability of components in combustion chamber and the mechanical performance of system movement pairs will be highly valued. Therefore, the reliability analysis technology, friction and wear test technology, fault diagnosis analysis and summary technology of various performance indexes of marine diesel engine are studied.(2) In terms of fuel use, the use of marine diesel fuel is developing towards diversification and recycling. For example, marine diesel engines not only use residual oil, heavy oil and waste oil from various clean raw materials, but also are easy to transport and simple in research and development design. Marine diesel engine using renewable fuel. In terms of energy saving and environmental protection of marine diesel engine combustion, the emphasis is on the research and development of high pressure and high efficiency combustion technology.