Abstract: At present, Boiler feedwater pump in thermal power plant is generally adopts hydraulic coupler as adjusting device; However, due to the limitations of the mechanical structure and regulation of hydraulic coupling, hydraulic coupler is low efficiency with small adjustable range. With the development of science and technology, a variety of new regulating device can be used as adjusting device for boiler feedwater pump.This paper mainly introduces principle, performance, renovation plan and cost for the planetary gear torque speed (VORECON) and Variable Frequency Drive (VFDS); The detailed comparison of effect and cost of two solutions is given by actual cases.Through a series of contrast analysis, this paper consider that Variable Frequency Drive solution is better than the planetary gear torque speed solution.