To realize a method, with which a single crystal alloy blade changed in a natural frequency without changing a blade profile design and the optimum aerodynamic design condition can be produced.

An inclined angle θ of the crystal main axial direction 2 with respect to the blade height direction 4, in which the natural frequency of the single crystal alloy blade becomes a prescribed value, is beforehand obtd. with an anisotropic vibration analysis. Successively, after connecting a chill plate 9 with a blade corresponding spacer 7 in a mold 6 in which the blade height direction 4 is inclined at an angle θ with respect to a gravity direction through a selector 8, the casting of the single crystal alloy blade is formed while pulling down this chill plate 9.