Abstract: Based on the demands of prevention, control, and management of biological invasion of exotic species in Hainan Island, an investigation was made on the species, distribution, and harm of invasive plants in the Island. According to our investigation, the invasion of exotic species in the Island was very serious. A total of about 160 exotic plants belonging to 38 families were found. A risk evaluation indicator system was established, which could be adapted to the local characteristics of ecological, economic, and social development. The indicator system comprised 5 firstclass indices, 12 second-class indices, and 42 third-class indices, and the weight of each index was determined by applying analytic hierarchy process (AHP) method. The risk of 50 exotic invasive plants was evaluated by using this indicator system, the levels of the invasion risks were determined, and the corresponding risk management strategies were put forward. The risk evaluation indicator system could be used as an important tool in early warning and decision management of biological invasion. In order to prevent the biological invasion and to guarantee ecological security, a rapid response system for Hainan biological invasion should be established based on the biological invasion risk assessment and management.

Key words: pollinators diversity, multi-scale effects, the lower reaches of the Yellow River., pan traps, landscape heterogeneity