利用三維粒子模擬軟件，比較研究了在磁控管模擬計算中三種陰極發射方式在電流控制、宏粒子數和計算速度上的不同，確定了Beam發射是電流控制的最好發射模式；在固定電子能量的基礎上，研究陰極電流發射密度分別為9 A/cm2、3 A/cm2和7 A/cm2下的輸出頻譜和模式競爭過程，研究結果表明：選擇合適的發射電流大小有利于磁控管頻譜噪聲抑制。

To reduce spectrum noise of magnetron, the method controlling the cathode current emission is considered by the three dimensional PIC code, to research the performance influence of the oven magnetrons. Compared three cathode emission models in the current control, particle number and simulation speed using the PIC code, the Beam models is the better of the electron emission model in the current control. When fixed the electron energy, the output frequency spectrum and mode competition are compared in the different current density 9 A/cm2, 3 A/cm2 and 7 A/cm2. Choosing the appropriate emission current, it is benefit for magnetron to suppress the spectrum noise.