应用中子活化分析（ＩＮＡＡ）技术对四川广元河西晚侏罗世恐龙骨骼化石及围岩的微量元素成分及含量进行了测定和研究。结果表明，恐龙骨骼化石中稀土元素（ＲＥＥ）、铀（Ｕ）、砷（Ａｓ）、钡（Ｂａ）等微量元素显示了高或极高异常，锌（Ｚｎ）却显示了低异常；而化石围岩的微量元素极大多数都无明显的异常。根据这些微量元素的组合特征，对该动物群的集群死亡原因作了初步的探讨。 The trace element composition and content of dinosaur skeleton fossils and surrounding rocks in the Late Jurassic of Hexi, Guangyuan, Sichuan Province, were determined by using neutron activation analysis (INAA) technique. The results show that trace elements such as rare earth elements (REE), uranium (U), arsenic (As) and barium (Ba) in dinosaur skeleton fossils show high or very high anomalies, while zinc shows low anomalies. Most of the trace elements in the surrounding rock have no obvious abnormalities. According to the combination characteristics of these trace elements, the cause of cluster death of this fauna was preliminarily discussed.