The example of the succession of the plant community on abandoned field in which Yang-chao (Leytnus chinensis) community didn't settle originally is given in this paper to emphasis the research, that was carried out with common ecological methods, on the formation of Yang-chao microcommunity, and the two-dimension diffusion process of the asexual-reproductioned tillering sta ndings of Yang-chao in the microcommunity.The discussion centres on following aspects: The relatively extensive area of the place inva...