Which plant,who lives together with Eucalyptus,is more favorable to improve the ecological environment in which Eucalyptus lives,more conducive to the national housing and economic development? In this paper,we compared the compound Colony of Eucalyptus and Sarcandra glabra with Eucalyptus Colony,to explore the influence of these two biocoenosis on some physical and chemical properties of soil,the growth of Eucalyptus and Sarcandra glabra and the quality of Sarcandra glabra.