Abstract: In order to identify the main ecological risk sources in Dongshan Bay,a semi-quantitative risk identification method including the intensity,scope and frequency of ecological risk hazards was established.It could make a quick and accurate judgment of the main ecological risk sources and have a good assistant role in ecological risk assessment.Through identifying and analyzing 18 ecological risk sources involved in Dongshan Bay,it was indicated that reclamation,typhoon,nuclear power construction and operation,environmental pollution and biological invasion were the main ecological risk sources in Dongshan Bay.Identification and analysis of ecological risk sources can provide decision-making basis and theoretical support for regional ecological risk managers.In addition to strengthen the prevention of major ecological risk sources,Dongshan Bay ecological risk management needs to improve its ability to prevent rapidly growing risks in the long run.