【目的】 孟氏隐唇瓢虫Cryptolaemus montrouzieri Mulsant生殖系统结构和卵细胞发生将为昆虫的系统进化关系及瓢虫分类提供依据，同时可作为瓢虫人工饲料研究开发的参考。【方法】 利用组织石蜡切片技术和光学显微镜，观察孟氏隐唇瓢虫生殖系统结构，以及自成虫羽化后不同发育阶段卵巢发育状况和成熟卵巢管卵子发生过程。【结果】 孟氏隐唇瓢虫雄性生殖系统包括2对附腺、1对精巢、1对输精管、1对贮精囊、射精管、弯管和阳基。雌性生殖系统包括2片生殖板、生殖腔、受精囊、中输卵管、1对侧输卵管和1对卵巢。单侧卵巢管数量在11~14根之间，卵巢管端部延伸出细长的端丝。卵巢管属于端滋式，分为原卵区和生长区。滋养细胞分散且细胞核几乎充满整个细胞，未见合胞体。卵细胞稀疏地集中在原卵区下端，并且可见营养索向卵巢管顶端延伸。根据卵细胞位置和形态，卵黄积累情况，滤泡细胞形态变化，将卵细胞发生分为前期，中期，中后期和后期。卵细胞发育后期，营养索消失，滤泡细胞排列疏松，细胞间隙增大。【结论】 孟氏隐唇瓢虫卵巢管的滋养细胞是端滋式卵巢管滋养细胞中的原始类型，且推测瓢虫科昆虫卵巢管滋养细胞均属于此类。卵细胞早期发育过程中，卵细胞通过营养索从滋养细胞获取营养物质。

     [Objectives]  To improve understanding of the phylogenetic relationships between insects and ladybird taxonomy in particular, and promote the study of artificial diets in ladybirds. [Methods]  The reproductive system and oogenesis of the ladybird Cryptolaemus montrouzieri Mulsant were investigated. An optical microscope was used to observe paraffin sections of the reproductive system, and different stages of ovarian development and oogenesis. [Results]  The male reproductive system includes two pairs of paragonial glands, a pair of testes, a pair of vas deferens, a pair of seminal vesicles, an ejaculatory duct, penis and tegmen. The female reproductive system includes two genital plates, a genital chamber, spermatheca, a median oviduct, a pair of lateral oviducts, and ovaries. There are between eleven to fourteen telotrophicovarioles per ovary. The terminal filament is on the top of the ovariole, which is divided into a germarium and vitellarium. Nurse cells fill the germarium, and oocytes at the base of this obtain nutrition from the nurse cells via a nutritive cord. Nurse cell nuclei almost occupy the majority of the cell and there are no syncytiums in the germarium. Based on variations of oocyte position and characteristics, follicle cells, and yolk deposition, the process of oogenesis can be divided into a prime, middle, transitional and post-period. In the post-period, the nutritive cord has disappeared and the gap between follicle cells is distinct. [Conclusion]  Nurse cells of C. montrouzieri are one of the three types known as the primitive, transition and secondary stages. We suspect that the nurse cells of ladybirds are of the primitive stage. In the early stage of oogenesis, the main way oocytes obtain nutrition from nurse cells is via nutritive cords