Abstract: To clarify the structural characteristics of the reproductive system of the adults of Euzophera pyriella, we dissected and analyzed the internal reproductive systems of male and female Euzophera pyriella adults. The results showed that: the internal reproductive system of male adult mainly consisted of a pair of testis to heal nearly spherical spermary which was connected with two seminal vesicles by vas deferens, and the lower end of seminal vesicles were attached to the front-end of accessory gland and the middle of ejaculatory duct by vas deferens, and the front- end of ejaculatory duct was jointed to accessory gland, the inferior extremity of ejaculatory duct was attached to injective spermiduct, the end of injective spermiduct and penis were interconnected. And the internal reproductive system of female adult was mainly composed of two group ovaries (four ovarian tubes per group), the upper end of the ovary was jointed to sling, the lower end of ovary was attached to two lines of lateral oviducts, the lateral oviducts converged to a single median oviduct, the terminal median oviduct was articulated with developed pyriform copulatory bursa, spermatheca and accessory gland capsule, and the copulatory bursa and spermatheca jointly communicated with the seminal duct, and the accessory gland capsule was related to accessory gland. The reproductive system of male adults consists of a spherical spermary, two seminal vesicles, vas deferens, one ejaculatory duct, two accessory glands and one injective spermiduct. And the reproductive system of female adults consists of eight ovaries, two lines of lateral oviducts, a median oviduct, a pyriform copulatory bursa, a spermatheca, an accessory gland capsule and a longer accessory gland.