Abstract: This paper deals with the analysis of the life table for natural population of whitebacked planthopper(WBPH) in Hailing island,Guangdong Drovince.The results showed that the populations of WBPHwere obviously controlled by imdigenous natural enemies.The adult emigrationplayed an important role in the population of the generation in the jointing stage of early ricThe fecundity of the next generation and the residency rate after migration of the adults were important control effects for the population trend.The proportions of adults emigrating varied from different genera-tions.The fecundity of next generation was an important factor as well as key factor.It is very important for the dynamics of the insect with long longenity to analyse the important factors and key factors.