To understand ecologically the relationship between plant community and the community and population of insect in a forest, the ecological effects that a change in the structure of plant community may have on insect community artd the population of Dendrolimus spectabilis Butter have been quantitatively analysed, based on the mathematical methods such, as canonical analysis, double screening for stepwise regression, etc, in which 9 parameters for plant community were taken as independent variables, arid 14 ...