The paper analyzes the main problems in drawing process,introduces a drawing method based on node sharing relationship analysis. Making full use of the function of the period of node,this method can accurately express the logical relations,avoid the redundant nodes and dummy arrows,significantly improve the efficiency of drawing.%介绍了一种基于节点共用关系分析的绘制方法，分析了绘制过程需要解决的主要问题，指出该方法充分利用节点的承启功能，能准确表达逻辑关系，避免出现多余的节点和虚箭线，明显提高绘制效率。
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