Abstract: In order to provide theoretical basis for the study of biological characteristics and systematic classification of Cyrtotrachelus buqueti Guer, the morphological anatomy, stereomicroscopy and scanning electron microscopy method were used to observe the morphological structure and characteristics of the respiratory system in the larva, pupa and adult stages of C. buqueti. The results showed that the larvae, pupae and adults of C. buqueti had developed integrated and strict four-stage tracheal system, and the inner wall of trachea was elastic and the spiral filaments formed a network structure which has the ability to resistant to stress. The adult had air sac and obvious spiracle structures. There were 9 pairs of spiracles on the adults’ body surface, 2 pairs of spiracles on the chest and 7 pairs of spiracles on the abdomen. Only one pair of spiracle on the middle chest was the external closed type, and the rest were the internal closed type. The spiracles were significantly smaller from the chest to the abdomen. The difference of respiratory system structure in the three stages was adapted to its living environment. The study was of great significance to the in-depth analysis of the relationship between the respiratory behavior, respiratory structure, growth, development and living habits of C. buqueti. It also enriched the morphological content of C. buqueti and provided theoretical basis for the systematic classification of weevil insects.