In the activity-on-arrow network, there are essential differences between positive activity and dummy activity.

双代号网络图中，虚工作和实工作有着本质的区别，其主要作用是传递工作之间的逻辑关系。

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In the activity-on-arrow network, there are essential differences between positive activity and dummy activity. The main function of dummy activity is to transfer the logical relationship in the work.

在双代号网络图中，虚工作和实工作有着本质的区别，其主要作用是传递工作之间的逻辑关系。

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In view of activity-on-arrow network drawing difficultly, describes the methods of determine the dummy arrow. It will enable the rapid and accurate drawing.

针对双代号网络图绘制困难的问题，介绍了绘图时虚箭线的判定方法，有利于快速、准确地成图。

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