由二级近似下的曲轴轨迹方程出发 ,探讨了静电曲轴宽电子束二级几何像差及其系数 ,并给出了适于计算的形式 .在大量管型计算的基础上 ,文中给出了两个实际管型的几何像差及系数的计算结果 ,并由此得出一级与二级几何像差的差异趋势 ,对实际像管的设计与计算具有一定的理论指导意义 Based on the second-order approximation of the crankshaft trajectory equation, the second-order geometrical aberrations of the wide-beam and the coefficients of the electrostatic crankshaft are discussed and the suitable forms are given. Based on the large number of tube-type calculations, The geometrical aberrations of the two actual tubes and the calculation results of the coefficients, and the difference of the first-order and the second-order geometrical aberrations is obtained, which has some theoretical guiding significance for the design and calculation of the actual image tube