Abstract: This paper deals with the neighborhood interference amongst the individuals of interspecies in plant community. Based on the previous work, the improved index model of neighborhood interference and the method of collecting information in the field are put forward. Logical and ecological meanings have been increased with improvement.In this paper, the problem of regression model of neighborhood interference effect is discussed, and the optimization model under the given conditions is also studied.As an example, Pinus massoniana forest at Jinyun Shan mountain in Chongqin is studied.