With the anode voltage and the cathode current changing,the variational process of the electron velocity ratio and spread is simulated,and the results of the average velocity ratio 1.1 and spread 9.5% are obtained.

• 在阳极电压和阴极电流变化的条件下；对电子速度比和速度零散随之而变化的情况进行了模拟；得到平均速度比1.；1和平均速度零散9