圆图软件设计要求计算结果以图形和数据并行输出，整个圆图软件分为用户图形界面模块、圆图计算模块、圆图演示模块。圆图计算模块分为反射系数计算、单支节匹配计算、输入阻抗计算及整个Smith圆图；画图演示模块分为等归一化电阻圆、等归一化电抗圆、反射系数圆等；确定阻抗值在圆图上的位置、圆图的基本应用、求输入阻抗及其在圆图上的位置以及单支节匹配等问题。-Chart Software design results in graphical and data parallel output, the circular mapping software into a graphical user interface module, circle diagram calculation module, the Smith chart presentation module. Circle diagram calculation module is divided into reflection coefficients, one branch of the matching calculation, calculation of input impedance and the Smith circle diagram　drawing shows the module is divided into so normalized resistance circle, and so the normalized reactance circle, reflection coefficient circle, etc.　determine impedance chart position in the circle, circle graph of the basic application, seeking input impedance and its location on the map in the circle, and one branch of the match and so on.