[Aim]  Drosicha contrahens is one of the most important pests on forest trees. To study the ultrastructure of the major wax glands and wax secretions of male and female D. contrahens at different stages of development. [Methods]  Detailed photographs of each instar were taken using scanning electron microscopy (SEM). [Results]  The results revealed that the males and females have two types of multilocular pores; single-centered and double-centered. There are also differences in the types of glands, and in the morphology of homologous glands between the sexes, as well as variations in the internal structure of homologous glands of different developmental stages. This species begins to secrete wax at the first-instar nymph stage. Wax secretion are of two types: Smooth C-shaped wax filaments secreted by the outer loculi of multilocular pores, and smooth solid long wax filaments secreted by the inner loculi of multilocular pores. Because of changes in the morphology of their outer loculi, adult males secrete C-shaped wax filaments with longitudinal ridges in the center. [Conclusion]  The number of multilocular pores gradually increases as female larvae grow and develop, so that wax secretions gradually cover their entire body surface which may protect them from external damage. The multilocular pores around the vulva secrete a sufficient amount of curved wax filaments that adhere to the body surface, protecting the vulva from honeydew contamination, as well as wrapping around the egg particles in the later stages of female development to prevent them from sticking together. The number of glands in males also increased until the pupal stage, but male pupae and adults have significantly fewer glands than earlier developmental stages, suggesting an adaptive adjustment during development. In addition, the morphology of       D. contrahens multilocular pores is taxonomically important.