Abstract: In order to filter out a chemosterilant which can be directly sprayed to sterilize the adults of Anoplophora glabripennis (Motschulsky) efficiently and to extend the method in vast area, two chemosterilants (wettable powder) which were developed by the study group, called CS Ⅰ and CS Ⅱ, were adopted on the comparing experiment with there sterilizing activity against the longicorn. The comparison of mating behavior, number of oviposited eggs, hatching rate and life table under artificial rearing, was carried out after spraying the two chemosterilants on the adults of the longicorn by a spray method which imitated the outdoor spray on trees. The results showed that the treatment spraying with CS [[ after diluting it 20 times gained best sterile effects on the pest.