Abstract: With the continuous increase in metal mining depth, heat hazards have become a key factor restricting safe mine production and threatening worker health. This study focused on high-temperature development roadways in metal mines and local forced ventilation and used Fluent numerical simulation software to establish three-dimensional physical models of a three-centered-arch main haulage roadway and a development roadway. The model fully accounted for the coupled effects of heat dissipation from the surrounding rock, mechanical heat sources, and airflow. With reasonable boundary conditions set （rock wall temperature of 38 ℃ and heat source temperature of 60 ℃）, the temperature and flow field distributions in the roadways were systematically simulated under different combinations of main haulage roadway inlet air temperatures （20 ℃ and 24 ℃） and ventilation duct air velocities （10 m/s, 15 m/s, and 20 m/s）. The influence of forced ventilation on the cooling performance at the heading face was analyzed using six comparative cases. The results show that increasing the air velocity at the ventilation duct outlet can effectively enhance jet rigidity, expand the cooling range in the development roadway, and significantly reduce the temperature at the heading face. When the air velocity increases from 10 m/s to 20 m/s, the maximum temperature at the heading face decreases by 3.3 ℃. Meanwhile, reducing the inlet air temperature of the main haulage roadway can improve the thermal environment throughout the development roadway. When a lower inlet air temperature is combined with high-air-velocity conditions, the average temperature at the heading face can be maintained below 27 ℃. In addition, the temperature distribution within the roadway shows obvious stratification and a heat return phenomenon. An increase in air velocity can slow the heating of the airflow. This study provides a theoretical basis and design guidance for ventilation optimization in deep development roadways in metal mines. It is recommended that a comprehensive strategy combining reduced supply air temperature with increased supply air velocity be adopted in engineering practice.