Abstract: From the perspective of large capacity steam turbine technology development,remarkable progresses from 2010 to 2019 and research prospect in China were reviewed.The background of large capacity steam turbine development was introduced,and new achievements on large capacity steam turbine technology research for thermal power and nuclear power in recent decade were summarized,including three technologies,such as the optimization of flow path and the performance at the wide range of load to improve efficiency; comprehensive design technology concerned with structural strength and lifetime,rotor dynamic and support,high temperature material and welding rotor to ensure safety; automatic turbine one-key start-up or shutdown control and thermal stress monitor to enhance the operation flexibility. Based on the development status,research prospect of domestic large capacity steam turbine was proposed in aspect 700℃ high temperature nickel alloy component,non-nickel alloy high temperature rotor,2 000~2 300 mm half-speed long blade for 2 000 MW nuclear power steam turbine,and intelligent technology of design,manufacture,operation and maintenance.Further target of large capacity steam turbine development is to promote the efficiency,guarantee reliability, safety and operation flexibility.