Abstract: In order to explore the permeability of droplets in porous materials under the action of a thermal field, a seepage dynamics model of droplets on the surface of porous materials was established by taking porous stainless-steel material as a research object. Tracking the change of two-phase interface during droplet permeation using COMSOL simulation software and level-set approach and, analyzing the percolation pattern and heat transfer properties of liquid droplets on porous surfaces, the permeation and spreading behavior of droplets in porous materials were discussed, and the influence of porous surface temperature on the seepage dynamics performance of droplets was studied. The study results show that: the capillary pressure in the pore structure drives droplet spreading and permeation in porous materials; during the droplet infiltration process, fluid vortex occurs at the front of the droplet spreading, the vortex brings the heat-absorbed, warmed fluid at the bottom backs to the center of the droplet, so that the temperature distribution inside the entire droplet is more uniform, and the permeability performance of the droplet is enhanced. Increasing the surface temperature of porous materials or reducing the specific heat capacity of droplets can improve the heat transfer between the solid-liquid phases, accelerate the internal temperature rise rate of the porous materials, and then enhance the permeability of the droplets in the porous materials. The results provide a theoretical basis for understanding the seepage and heat transfer mechanism of droplets on the surface of porous materials.