根据7针状电极系上的电势,利用边界元积分方程建立以针状电极系线电荷密度为未知量的离散方程,通过求解线性方程组计算针状电极系上线电荷的不均匀分布.由针状电极系上的不均匀线电荷分布计算真空状态下空间任意一点的电势分布,实现了由边界元法对7针状电极系场分布的数值计算. According to the potential of the 7-acicular electrode system, a discrete equation of the acicular electrode line charge density is established by using the boundary element integral equation, and the non-uniform distribution of the line charge on the acicular electrode system is calculated by solving the linear equations. The distribution of potential at any point in space under vacuum condition is calculated by the nonuniform linear charge distribution of the electrode system. The numerical calculation of the distribution of the 7-pin electrode system field by the boundary element method is realized.