Abstract: Paper presents a method for achieving the maximum blade efficiency in steam turbine design and it can be used by designers to determine these parameters, such as number of stage, mean diameter of stage, heat drops of stage, nozzle-angle α1, velocity ratio u/c1 and degree of reaction. The proposed method makes use of the Parsons-number X as the basic design parameter linkings the attainable level of efficiency with the stage’s dimensions and hence in same way the costs of its production. The concept of this method used only for degree of reaction ρ=0.0 and P = 0.5 was presented the first time 33 years ago by Prof. Dr. Robert Szewalski. The author utilizing the same basic method develops it in wide range of degree of reaction and presents a new concept of optimal degree of reaction, for steam turbine design. The paper also considers to apply this method for the twisted blade design and point out the direction for realizing its higher, level of efficiency.