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应用多极场理论，研究了超大偏转角情况下的偏转像差，给出了应用十四极场做七级像差校正时的多极场表达式，计算了在多种情况下十四极场对七级像差校正的影响，同时还分析了多极场像差校正的方法。
The multi-polar field theory is used to study the deflection aberration under the condition of oversized deflection angle. The multi-polar field expression when using the fourteen-pole field to do the seven-level aberration correction is given. In each case, Field on the seven-level aberration correction, but also analyzed the multi-polar field aberration correction method.