Over the past decade virtual reality (VR), augmented reality (AR), and mixed reality (MR) technologies have been applied to the construction industry. The 3D geological models are also used to visualize the ground information for revealing the risk of geology in the geotechnical industry, and new approaches using VR/AR/MR technology are useful in understanding the relationship between the ground and structures. In this paper, examples of the application of MR technology will be introduced to further clarify how this technology changed the geotechnical industry.