Abstract: On the basis of reviewing the construction history and achievements of loess tunnels in China, this paper systematically summarizes the construction technologies of loess tunnels for railways, highways, etc. The main contents include, (1) Fundamental theories: loess constitutive models, classification of surrounding rock, the boundary between deep and shallow burial, and load; (2) Design methods: design standards, structures and supports, portal protection; (3) Construction technology: excavation methods, surface settlement control technology, and foundation treatment technology. In view of the current status of engineering technology levels of loess tunnels, and by courtesy of the improvement of modern information technology, artificial intelligence, and large-scale mechanized equipment capabilities, this paper proposes directions for the development of basic theories of loess tunnels, intelligent survey and design, and safe and rapid construction.