Dynamic balance-testing method for a golf club shaft

1. A dynamic balance-testing method, comprising steps of:

fixing a first end of a golf club shaft, the golf club shaft is provided with a plurality of predetermined angular directions on its radially outer circumference;

measuring reacting force of a second end of the golf club shaft in the predetermined angular directions with respect to an axis of the golf club shaft;

calculating a minimum difference of reacting force of any two opposite directions; and

determined a preferred balance direction according to the minimum difference of reacting force and selecting a preferred striking direction perpendicular to the balance direction of the golf club shaft.

2. The dynamic balance-testing method as defined in claim 1 , wherein the first end of the golf club shaft is mounted in a clamper which is rotatable for rotating the golf club shaft and positioning in the predetermined angular directions.

3. The dynamic balance-testing method as defined in claim 1 , wherein the reacting force of the second end of the golf club shaft is measured by a dynamometer.

4. The dynamic balance-testing method as defined in claim 3 , wherein the dynamometer is formed with a slot adapted to rotatably receive the second end of the golf club shaft.

5. The dynamic balance-testing method as defined in claim 1 , wherein the second end of the golf club shaft is bent a constant displacement for measuring the reacting force.