Abstract:With permanent field surverys on long-term site,in 1980 and 1994,the population structure changes and community structure changes in Pinus massoniana community in Dinghushan within 14 years'succession process were studied. The results showed that tree species number increased from 4 to 7.The composition structure of community was optimizing. The species diversity and evenness of community were increasing,i.e.the Shannon-Wiener index increased from 0.58 to 1.60,the evenness index from 0.29 to 0.69,while Simpson index decreased from 0.83 to 0.38.In the process of 14 years'succession, the population structures of dominallt species in community had been changed.Although Pinus massoniana, the pioneer species of community happening,was still dominant,its declining trend was obvious. Zonal climax community forming species, such as Schima superba,were greatly developed.The community was changing into mixed forest acceleratedly.