Abstract: This paper makes close analysis, using formation bable method and quantitative classification method, on the materials obtained from the field investigation of Xiuyan County, Liaodong Peninsula. The Zoysia japonica Formation in this area can be divided into four types of associations, namely, Ass. Zoysia japonica Ass. Zoysia japonica+Carex nanella. Ass. Zoysia japonica+Carex napella+Indigofera kirilowii, and finally Ass. Zoysia japonica+Carex nanella+Perennial forbs. This paper discusses into details of the component of species and their life-form, the structure of community and the vertical distribution of biomass of these associations. The principal component analysis (PCA) shows that light intensity in grassy layer of community and the content of organic matter in soil constitute the main natural ecological factors that affect the formation of the associations. The correlative analysis further reveals that the light intensity in grassy layer is positively correlative with aboveground biomass and ear sprouting rate of Zoysia japonica. the organic matter content in soil is negatively correlative with them. The paper also describes the succession law of Zoysia japonica commnunity. It points out that human activity plays very important roles in this succession. proper period and intensity for pasturing, mowing and seed-harvesting will be helpful to make full uses of Zoysia japonica resources.

Key words: Liaodong Peninsular, Zoysia japonica, association, classincation, ordination, ecological factors