Abstract: The natural environment and biodiversity of Beidagang wetland nature reserve in Tianjin are introduced,and the main threats of Beidagang wetland biodiversity are analyzed,including：serious invasion of alien species,more frequent human activities and lack of stable guarantee of ecological water use in wetlands. At the same time,the corresponding protection countermeasures are put forward,including：improving the management and protection system of protected areas;strengthening the monitoring and management of alien invasive species;implementing water environmental treatment and water ecological restoration;constructing a diversified monitoring system,etc.

Key words: Beidagang wetland, biodiversity, conservation status