Abstract: To obtain the two-phase flow parameters of low-permeability coal reservoirs, the dynamic characteristics of methane migration in water-saturated coal were analyzed systematically in this study. The two-phase fluid flow behaviors were identified through the gas migration experiment of water-saturated coal samples. Meanwhile, certain parameters were acquired, such as gas-phase permeability, displacement pressure, adsorption rate and etc. The results show that capillary displacement pressure needs to be overcome during the methane migration in water-saturated coal, and its value is increasing with the decrease of permeability. Based on the size relation between pressure difference and displacement pressure, the methane migration in water-saturated coal can be divided into two stages, i.e., capillary-force control and diffusion control. Gas loss exists, and methane remains in coal pores during the capillary-force control stage, while methane is adsorbed on coal surface during the diffusion control stage. The capacity of gas diffusion is reduced due to water phase. The higher the permeability is, the smaller the adsorption rate will be. These research results are favorable to improve the test method of two-phase flow parameters in low-permeability water-saturated coal and optimize the production system of water-saturated coalbed methane reservoirs.