<p>This study proposes a model for an intersection utility tunnel, the purpose of which is to investigate the influence of fire source location and longitudinal ventilation on the ceiling temperature distribution. The results of the simulation demonstrate that the configuration of the intersection structure has a considerable effect on the rate at which smoke propagates from the fire source to areas of the tunnel that are on the opposite and branch sections. The proximity of the fire source to the intersection significantly the affects temperature distribution in adjacent regions, with each area exhibiting distinct temperature characteristics. Furthermore, wind speed plays a critical role in the spatial diffusion of high-temperature zones and the intensification of fire conditions. A thorough examination of the effect of wind speed on temperature variations across different regions has resulted in the identification of two distinct scenarios: Firstly, the main tunnels fire source side and the branch section can be classified into low-speed zones (<i>v</i> ≤ 2 m&#xa0;s⁻¹) and high-speed zones (<i>v</i> ≥ 3 m&#xa0;s⁻¹). Conversely, the impact of wind speed on temperature decay patterns is relatively insignificant on the non-fire source side of the main tunnel. A series of empirical formulas were derived on the basis of observed trends in temperature attenuation. The purpose of deriving these formulas was to characterize temperature decay across varying regions and wind speed conditions. A subsequent comparison of these formulas with previously established models was made, revealing that existing temperature attenuation models exhibit substantial adaptability for the non-fire source side; however, they are less applicable to other tunnel regions. The findings from this research provide valuable insights for the development of fire prevention and control strategies in intersection utility tunnels.</p>