On the basis of the analysis of the twisting vibration of rotary sucher-rod string, a formula of calculating every harmonic vibration eigenfrequency is presented.

• 在综合分析抽油杆破坏形式的基础上 ,肯定了采油过程中抽油杆扭转振动的客观存在 ,分析了抽油杆产生扭转振动的原因。