本文用相平面法讨论静电陀螺仪在静电场干扰力矩作用下的大范围漂移运动。根据相平面中奇点的分布和类型判断转子极轴相对电极的平衡位置及其稳定性,以及平衡位置附近陀螺顶点轨迹的几何特征。分析结果有助于认识捷联式静电陀螺仪的漂移规律,并提示平台式静电陀螺仪正确选择极轴工作位置的重要性。 In this paper, the phase-plane method is used to discuss the large-scale drift motion of the electrostatic gyroscope under the electrostatic disturbance torque. According to the distribution and type of the singular points in the phase plane, the equilibrium position and stability of the rotor pole relative electrode and the geometrical characteristics of the gyroscope locus near the equilibrium position are determined. The analysis results help to understand the drift law of the strapdown electrostatic gyroscope and suggest the importance of the platform electrostatic gyroscope to choose the working position of the polar axis correctly.