Abstract: Researches on key technologies in the field of intelligent energy efficiency have been playing important role in development of intelligent Ship. This paper comprehensively analyzes the status of application of big data and artificial intelligence to ship energy optimization. The advances in following fields are highlighted: whole ship energy monitoring and analysis; perception of navigational environment; intelligent evaluation of whole ship energy efficiency and the influencing factor relation analysis; intelligent prediction of ship energy efficiency; optimization of ship speed, route, and trim. The development trend of the technology in the field is discussed.