Today"s society has entered the stage of rapid development of artificial intelligence, and machine olfaction is an emerging technology developed in the 21st century. Odor reproduction is an important part of machine olfactory system, which has attracted increasing attention from the scientific and industrial circles. This paper focuses on the theory of odor reproduction and the way of odor generation. At the same time, it classifies, compares and analyzes the existing odor reproduction technology. The current challenges of odor reproduction are summarized and its development prospects are presented.