Abstract: Based on the wireless transmission characteristics of mines, the super-high-frequency band and the curved and fork position of the tunnel were tested for the passive reflection effect of the metasurface. A modified cross-shaped structure unit of the metasurface array was proposed and tested the reflection signal ability of the 5.8GHz signal at Qingshuixi tunnel incline curved roadway and main auxiliary section fork using mining wireless equipment. The test was conducted using omnidirectional and directional antennas at a fixed incident and receiving distance, and the SNR and RSRP enhancement effects before and after loading the metasurface were compared. The line-polarized horn directional antenna showed an RSRP enhancement of 13dB. It was pointed out that there are problems such as difficulty in aligning the incident wave angle, difficulty in concentrating the beam, and short incident distance in the application of metasurface passive reflection in tunnels, and it was inferred that metasurface passive reflection is suitable for fixed installation at tunnel junctions for point-to-point transmission to fill coverage gaps.