Abstract: In order to solve the problem of steam seal spring failure,steam seal wear and large clearance of 2 x300 MW steam turbine unit in a power plant,the application research of steam turbine following-up suspension tooth seal is carried out.And the working principle,technical characteristics and transformation scheme of steam turbine following-up suspension tooth seal energysaving technology are introduced.The practical application shows that the following-up suspension tooth seal technology has remarkable energy-saving effect and good prospect for promation and application.