Abstract: To solve the problems of strong limitations and low efficiency of safety training in traditional disaster avoidance simulation methods for underground mines，a disaster avoidance simulation system and functional architecture based on mixed reality were established，and a disaster avoidance simulation system for underground mines was designed. This system is based on mixed reality devices. Through the Unity 3D development platform，the three-dimensional model of the mine and the mixed reality scene is established， the underground road network is designed，and the A* path optimization algorithm is improved to realize functions such as the display of basic mine information，the display of shaft and ore body models，and the vi‐ sualization of disaster avoidance simulation path information. And the system application test is carried out on the HoloLens 2 mixed reality device. The results show that the underground mine disaster avoidance simu‐ lation system based on mixed reality established can effectively help underground workers comprehensively understand the information of underground mines through natural interaction and improve the disaster avoid‐ ance ability，which provides strong data and technical support for the new method of underground disaster avoidance work，and has broad application prospects and promotion value.

Key words: underground mine, disaster avoidance simulation system, mixed reality, A* algorithm