Abstract:The fragility of ecosystem is a wide-confining term and is regarded as inherent property of an ecosystem. It could display only when exposed to disturbance which causes the degradation of ecosystem however it is impacted by natural or nonnatural factors. The concepts of fragility and stability, the fragility in relation to species invasion and extriction, to diversity and stability of ecosystem, to primary productivity, to niche differentiation as well as to microclimatic change of ecosystem are discussed. The application of theory of fragility to the vegetation recovery is suggested.