Abstract: Based on the field survey of alien plant invasion and the consultation of related literatures and specialists, a list of invaded and potential alien plants in Xiamen City was compiled, and the causes of alien plant invasion in this city were analyzed from the aspects of climate, soil, vegetation community structure, geographical characteristic, natural and anthropogenic disturbances, and transportation, etc . Based on the previous researches in bio-invasion risk assessment, and aiming at the present situation in Xiamen, a risk assessment system for alien plants invasion was established, which consisted of three parts, i . e . , probability of migration and establishment, hazard and impact, and prevention and control, and included 6 primary indexes and 17 secondary indexes.

Key words: Land use, Landscape pattern, Change, Taihu Lake Basin