Abstract: To assess the invasion risk of alien marine species, an invasive risk assessment model was constructed based on the analysis of the biological invasions processes and mechanisms, which combined with the multi-hierarchy fuzzy comprehensive evaluation. Through to establish risk assessment index of marine biological invasions, the definition of the invasive factor and subjection degree of qualitative index, and evaluated the weight of invasion damage, a clear risk assessment composite index of marine invasive alien species was calculated. The invasive risk of Spartina plantations (such as Spartina anglica, Spartina alterniflora and Spartina patens) were assessed by this model. The results identified the grade of cordgrass Spartina alterniflora and Spartina anglica as very high risk, and Spartina patens as medium one.

Key words: alien marine specie, biological invasion, risk assessment, risk prediction, Spartina plantation