This paper analyzes the main characteristics of the invasion of exotic and detrimental plant pests in China as well as their regularity of outbreak and potential risk.

Through the analyses of the characteristics and hazard of aquatic invasive alien plants that threaten the ecological security,this paper proposed the content,process,indicator system,and method for the ecological security assessment of aquatic macrophytes introduction.

The alien plants and environment evaluation of Yinggeling Moutain, Hainan, China;

Studies on flora composition and distribution characteristics of alien plants in Taizhou;

It proves that all these alien plants leaves are good raw materials of re.

Especially,ecologists put more emphases on the mechanism of invasion success of exotic plants because it is the key to prevent and control the plant invasiveness as a theoretic support.

Based on our survey on the exotic plants of Shenzhen, 102 species of exotic plants with the introduction of 10 important invasive species, about 10% of total wild plants, are reported in this paper.

And also the growth form, habitat, and origin area of exotic plants in Macau are discussed.