根据分析抽油杆柱中和点的计算公式得出,抽油杆柱的中和点与应力变化密切相关,而准确确定抽油杆柱中和点的位置在采油工程中是至关重要的。扶正器间隔和个数的计算及加重干长度的计算都离不开准确计算抽油杆柱的中和点位置。井口回压作为一种反作用力加载在抽油泵柱塞上,在某种程度上影响着抽油杆柱中和点的位置。文章通过胡克定律及受力数学模型计算公式分析了井口回压对抽油杆柱中和点的影响。 According to the calculation formula of sucker rod column neutral point, it is concluded that the neutralization point of sucker rod column is closely related to the change of stress, and accurately determining the position of sucker rod column neutral point is crucial in oil production engineering . Centralizer interval and the number of calculations and increase the calculation of dry length are inseparable from the exact calculation of sucker rod column and the neutral point position. The well head back pressure acts as a kind of reaction force on the pump plunger, to a certain extent, affects the position of the sucker rod center and the point. The article analyzes the effect of well head back pressure on the neutral point of sucker rod string by Hooke’s law and formula of mechanical model.