用MAFIA程序计算了电子回旋加速器加速腔上加速孔、阴极孔、辅助孔 (第Ⅱ加速型 )对加速场分布的影响。计算结果表明 :进行粒子动力学模拟计算时 ,忽略这种影响是合理的。另用对电子加速到最终能量跟踪计算的方法 ,同时以能散度为依据 ,计算电子稳定加速的参数范围 ,并给出S波段电子回旋加速器工作参数的计算结果。计算用C语言编制的程序在微机上进行。 Using MAFIA program, the effects of accelerating cavities, cathode holes and auxiliary holes (Ⅱ accelerating cavities) on the accelerating field distribution of electron cyclotron were calculated. The calculation results show that it is reasonable to neglect this kind of influence when doing particle dynamics simulation. In addition, the method of electron acceleration to the final energy tracking calculation is used. At the same time, the range of parameters for the steady electron acceleration is calculated based on the energy divergence. The calculation results of the working parameters of the S-band electron cyclotron are given. Calculated with C language program written in the computer.