It is proved that a simple graph G is automorphism line graph if and only if the graph G is 2-regular graph.
首次给出自构线图的定义，并证明：简单图G为自构线图的充要条件是图G为2-正则简单图。
It is proved that a simple graph G is automorphism line graph if and only if the graph G is 2-regular graph.
首次给出自构线图的定义，并证明：简单图G为自构线图的充要条件是图G为2-正则简单图。
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