Abstract: Abstract:In the design of flow path reformation for the steam turbine of the 330MW unit, several aspects were optimized, which include the area of the governing stage, the selection of the last stage blade, the back pressure optimization, the structural style of the cylinder body, the sealing of steam admission and steam extraction, the bearings and pushpull devices and the heat supply reformation. The actual effects show that the target of the reformation was realized, and the safety and economic efficiency of the unit were improved.

Key words: Keywords:steam turbine, flow path reformation, optimized design, effect