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Dynamic parameters of standard blades for helicopters were calibrated by dynamic balance test. In order to determine parameters of the dynamic balance test for standard rotor blades, a theoretic analysis method based on the blade element theory is proposed. The Duffing flapping moment equation with cubic nonlinear item for a single blade was set up by breaking up the flapping angle, and the stable threshold value on the parameter of wind speed for the Duffing flapping moment equation was analyzed by Melnikov function. Comparison of the During flapping moment equation with the first-order flapping equation indicates that high wind speed and large flapping angle will bring large errors, and the wind speed range required in dynamic balance test for standard rotor blades is determined by simulation methods, the test data are uniform with the technical parameter of wind speed range required in dynamic balance test for rotor blades of helicopters made in France. The results indicate that the flapping moment of standard rotor blades is stable for wind speed in dynamic balance test, and the determination of the wind speed range for the environment of dynamic balance test is appropriate. [ABSTRACT FROM AUTHOR]