Volcanic gas reservoirs have features of strong heterogeneity and difficult development. The laboratory experiment results show that the shapes of gas-water relative permeability curves and the values of feature points are related to the experimental conditions. In the same core, the higher the temperature, the pressure, or the content of CO2 is, the lower the irreducible water saturation is, and the faster the gas relative permeability rises, the better the seepage of gas-water is. During the process of gas driving water, the fractures have significant influences on the bound water saturation and the percolation characteristics of gas-water.