关于静电场线的绘制，许多人都是通过软件的符号计算系统解常微分方程来实现。而这种方法计算量过大，并且需要人为的构造常微分方程，使得通用性不高。本文试图通过最原始的数值差商方法，对电场线进行绘制。-Electrostatic field lines on the drawing, and many people are symbolic computation system through software solution of ordinary differential equations to achieve. And this method is too large, and the need for artificial construct ordinary differential equations, so versatility is not high. This paper attempts to the most primitive numerical difference quotient method, the electric field lines are drawn.