提出了运用双束电子束增加回旋行波放大器带宽的新想法，建立了模型并对其做了理论分析和数值模拟．研究表明：该模型不仅可产生宽的输出带宽和高的输出功率，且与已有宽带模型相比，增益要高得多．当两束电子束的电流均为１０ Ａ，电压分别为９０ 和１５３ ｋＶ，速率比分别为１０ 和０６２ ，纵向动量散度分别为５５ ％ 和１２ ％ 时，器件输出的饱和带宽至少可达到２２ ％ ，峰值功率和指数增益分别为３９５ ｋ Ｗ 和６２ ｄＢ，效率为１６ ％ ；如果在相互作用区的末段对引导磁场进行弱的锥化，可以得到约２３ ％ 的常量驱动带宽，输出功率仍有２８０ ｋ Ｗ A new idea of ​​increasing the bandwidth of gyro-traveling-wave amplifier by using two beams of electron beams is proposed. The model is established and analyzed theoretically and numerically. The results show that this model can not only generate wide output bandwidth and high output power, but also gain much higher than the existing wideband model. When the current of the two electron beams is 10 A, the voltages are 90 and 153 kV respectively, the rate ratios are 10 and 062 respectively, and the longitudinal momentum divergences are 55% and 12%, respectively. The output saturation bandwidth is at least 22%, the peak power and the exponential gain are 395 kW and 62 dB, respectively, and the efficiency is 16%. If the leading field is weakly tapered at the end of the interaction zone, about 23 Constant drive bandwidth of%, the output power is still 280 k W