Abstract: Wetland is viewed as the “Kidney of the Nature”,while wetland ecosystem is being destroyed seriously.In the disturbance of wetland ecosystem,plant invasion has become the main factor,and wetland plants have higher invasiveness.Therefore,wetland and plant invasion are the hotpots in modern ecological study.We summarized the main reasons why wetlands are more easily invaded,e.g.,diversity and wide distribution of wetland habitats,relativity of wetland’s location with plant seed’s diffusion routes,disturbance,eutrophication,frangibility of wetland,and lack of natural enemies;introduced 21 worldwide plant species with higher invasiveness in wetland and their ecological behaviors;and analyzed five hypotheses about the plant invasion in wetland,i.e.,natural enemy’s evasion,broader tolerance,efficient use,heterosis,and allelopathy.

Key words: Landscape ecology, GIS, Landscape analysis system, Patch boundary pixel set