Abstract: The logic detection of the process is important in the Activity on Edge（AOE） network.This paper discusses the relationships between the events and the pre-conference events in network，and the node coding algorithms how to get the node numbers.An improved new loop detection algorithm is proposed，using an extended adjacency matrix and applying an auxiliary queue.The new algorithm can create an effective sequence of events with distributed characters.Without adding virtual activities as well as the relationships among the individual pre-conference events，and no calculation of operating，the new algorithm is more efficient and less complex to get the result.

Key words: network schedule graph, Activity on Edge network, loop detection, pre-conference events

摘要： 针对AOE网进行活动流程合法性检查，讨论了项目管理中网络计划图的各个活动与其紧前活动间关系以及传统节点编号方法，提出了一种改进网络计划图回路检测算法。改进算法采用AOE网扩展邻接矩阵存储形式，通过辅助队列的应用，得到活动安排的有效序列，并使安排序列具备并行性特征，更加高效实用，有效降低了计算难度。

关键词: 网络计划图, AOE网, 回路检测, 紧前活动