ased on the population density,age-structure,specific-time mortality and physiologicaltime of cotton aphid(Aphis gossypii), a model for estimating energy dynamic parameters ofoverlap insect population was established,and the energy dynamics and ecological efficiencyof cotton aphid population were evaluated and analysed in eight agroecosystems. The resultsshowed that : 1 )the whole“summer aphid”production accounted for 98%of the annual cottonaphid production,and“seedling aphid”and“autumn aphid”producti...