The necessity of regulating mechanism operation in thermal power generating units is introduced.The situation of the domestic and foreign research on high power gear variable speed coupling device in recent years are summarized

including strength analysis of impeller with FEM

the CFD numerical simulation of the inner 3-D flow in hydrodynamic transmission elements

and the experimental study on the inner complex flow in hydrodynamic elements.The key technology of large-scale gear variable speed coupling device are presented

such as high-speed tooth profile correction

lightweight design for housing as well as high efficiency test platform and so on.