本文推导了轴对称静磁体系中磁轴向力和径向力的关系式从而对静磁系统的不稳定性(Earnshaw定理)做了定量地描述,同时讨论了轮对称静磁悬浮可能出现的三种平衡态。 In this paper, the relationship between the axial force and radial force in an axisymmetric magnetostatic system is deduced to describe the instability of the magnetostatic system (Earnshaw’s theorem) quantitatively. In the meantime, the possible three Balance.