Abstract:Stand spatial structure of Pinus massoniana and broadleaved mixed forest in Fujian was investigated using three structure parameters （mingling, neighborhood comparison, and uniform angle index-neighboring tree distribution pattern）. The results showed that P. massoniana was the dominant species in the mixed forest, which exhibited aggregation of single species, and the rest tree species were more or most intensive in mingling. When using neighborhood comparison method to characterize the size differentiation of trees, P. massoniana had an advantage over other species which differentiated seriously both in dominant species and suppressed species. Considering tree distribution pattern using uniform angle index, the stands in this community was found to be a clumped distribution.