Steam turbine is an important energy conversion equipment,and its application of high efficiency and energy saving technology is of great significance for improving energy utilization efficiency and reducing energy consumption.The concepts and objectives of high efficiency and energy saving technologies for steam turbines are summarized,and the key technologies to improve the efficiency of steam turbines are introduced in detail,including combustion system optimization,high temperature material application,steam reheat and recompression technology,and waste heat recovery and utilization.Some turbine projects which have successfully applied high efficiency and energy saving technology are listed,and their energy saving effect and economic benefit are analyzed.