Microchemical technology is a front technology of multi⁃disciplines in chemical engineering fields. The technology core is microscale transfer and chemical reaction in microchannel reactor. The application of microchemical technology can improve resource⁃utilization efficiency for energy saving and consumption reduction, enhance security, intensification and miniaturization of the chemical process, by decreasing dispersion scale, strengthening mixing and transfer, raising control and efficiency. The technology principle, characteristics, advantage and industrial application of microchemical technology were introduced, with the aim of deepening people's understanding of the microchemical technology, and then promoting the development and application of microchemical technology.