分析了爆炸式发射的物理机理，在二维Yee网格模型的基础上推导出了爆炸式发射的发射条件及逃离阴极表面的粒子电荷的计算公式，讨论了在程序中如何用唯相的方法来描述爆炸式发射的二维粒子模拟实现过程，并以向内发射同轴二极管为例从其电流电压关系及电子束运动特性方面验证了模拟的正确性。关 键 词 爆炸式发射; 二极管; 粒子模拟; 击穿Abstract The physical mechanism of explosive emission was analyzed. The conditions of emission and the formula to calculate the charge that would be drawn away from the cathode surface were educed based on the Yee model. Especially, discuss how to use the way of phenomenological des cription to realize particle-in-cell simulation in two-dimensional of explosive emission. Inward-emitting coaxial diode was used as an example to validate the corrections of simulation from current-voltage correlation and characteristic of electron beam movement.Key words explosive-emission; diode; particle-in-cell simulation; breakdown