Abstract: Semiconductor gas sensors have received wide attention from researchers for their low operating temperature, good cycling stability and short response recovery time to meet the increasing demand for organic volatile gas detection. As an organic volatile compound, trimethylamine plays an irreplaceable role in industrial production. However, its inherent irritating odor and low toxicity pose a threat to human life safety. Although many research papers concerning triethylamine gas detection have been published in recent years, there are few comprehensive review articles. In this paper, the response mechanism of enhancing gas sensitivity of triethylamine sensor and the internal factors to improve the gas sensitive response are reviewed firstly, and the detection of triethylamine gas by compound semiconductor sensor based on different metal oxides is summarized. Meanwhile, the relationship between the morphology of different materials and the gas sensitive performance is introduced in detail. Finally, it prospects the field of triethylamine gas sensing, and provides a theoretical basis for the follow-up work in related fields in this paper.