Abstract:Sinosideroxylon wightianum communities in Dananshan Region in Shenzhen City, Guangdong Province, China were investigated in 2006. The results showed that Sinosideroxylon wightianum was simple dominant species in communities, which usually grew at barren hill, slop field and hollow, with patch distribution. S. wightianum communitiesy could be divided into ten types; and S. wightianum was a characteristic species in evergreen broad-leaved forests. The population structure of S. wightianum community was simple, species distribution was uneven, and species diversity index were different among communities. S. wightianum population was dominanted by class II small trees with class I seedlings and III strong trees, which indicated that S. wightianum population would keep dominant in communities in a long time. Interspecies association between S. wightianum and other species, such as Toxicodendron vernicifluum, was week, indicating thatthe communities were at early succession stage.