In allusion to the problem of designing the similarity test model of using straight blade to predict the inherent characteristics of the real torsion blade

a dynamical similarity model designing method of the straight test model blade and a revising strategy were put forward under the condition to have the same inherent characteristics. Research shows that

the torsion blade when the torsion angle in the similar intervals (natural frequency error is less than 5%)

can predict the inherent characteristics directly using the geometry similar straight blade. When the torsion angle not in the similar intervals

need to modify the inherent characteristics with correction coefficient

and the modified values can predict the inherent characteristics of the prototype blade accurately.