Abstract:Emmenopterys henryi, an endemic species in China, is one of the grade II rare and endangered plants for the National Key Conservation. Based on the data collected from sample plots, intra-specific and inter-specific competitions were analyzed, using the methods of niche and Hegyi′s competition index model for the individual trees. The results showed that the niche breadth of E. henryi was the greatest in the community. The niche overlaps were in an order of Cunninghamia Ianceolata > Litsea. rubronervia > Lindera glauca > H. miconioides > Camellia cuspidate. There was a great value of niche overlaps among the species of L.glauca, C.cuspidate and L. rubuonervia with very similar eco-environment requirements. The results of Hegyi′s competition index model for individual trees indicated that the competition intensity increased with the diameter at breast height (DBH) at early stage, decreased after DBH was greater than 15 cm. Relationship between the competition index and the base diameter of objective tree conformed closely as a power function. The competition intensity was in the order of E. henryi > C. Ianceolata > H. miconioides > L. rubronervia > L. glauca > C. cuspidate. The results of the two methods were accordant, for example, the competition in intra-species was more intense than that in inter-species and the competition between E. henryi and C. Ianceolata was the most intense in inter-species, whilst the competition between E. henryi and C. cuspidate was the least. Therefore, it′s better to integrate the two methods to study the intra-specific and inter-specific competition. Some favorable eco-environmental measures for artificial forestry should be developed the forest management.