<p>Utilizing geothermal resources for road de-icing and snow-melting operations in winter can not only achieve clean and efficient energy utilization, but also avoid environmental and structural damage caused by chemical de-icing agents, demonstrating good sustainability and application prospects. As a stable and renewable shallow geothermal resource, geothermal energy is particularly suitable for scenarios requiring long-term and stable heating, providing a new technological pathway for active ice-prevention and snow-melting on roads. This paper proposes a buried-pipe heating system utilizing geothermal energy for road snow-melting and de-icing applications, and investigates its thermal performance and operational characteristics through numerical simulation. First, a multiphysics coupled model based on conjugate heat transfer is established to analyze the temperature distribution around the pipe at a microscopic scale, revealing the heat transfer mechanism of pavement heating. Subsequently, a comprehensive 3D numerical model of the snow-melting system is developed, and the coupling between fluid flow in the pipes and heat conduction in the solid domain is simulated using COMSOL Multiphysics. The feasibility of the geothermal-based system is verified, with a focus on the influence of pipe flow velocity on system performance. The main conclusions are as follows: (1) As the distance from the pipe layer increases, the temperature gradually decreases, indicating that the pavement zone is the primary region for heat dissipation (2) At lower flow velocities, heat exchange between the pipes and the surrounding environment becomes more thorough. (3) In the snow-melting and de-icing system, as the pipe flow velocity increases, both the outlet water temperature and the pavement surface temperature rise and eventually stabilize. Meanwhile, the proportion of heat transferred vertically upward and the overall thermal efficiency increase with higher flow velocities.</p>