Abstract: The cooling coefficient in heading face of metal mine is one of the important parameters for calculating the required amount of cooling for tunneling and related to whether to achieve the desired cooling effect and economic investment influencing the cooling engineering.With the aid of the mine deep mining cooling test system，the cooling process in heading face under four conditions of ventilation cooling，cooling by increasing air flow，refrigeration cooling and cooling by increasing refrigeration are simulated，and the cooling effect in heading face is analyzed.After ventilation and cooling by increasing ventilation，the temperature in heading face was dropped first，stabilized，and then kept still.Only the refrigeration measures can lower the temperature in heading face.With the monitoring data，the refrigeration coefficient is calculated out by using the enthalpy difference.At the same time，it is obtained that the refrigeration coefficient ranges at 1.38~1.68 from many experiments.This research provides the design basis for design of cooling in heading face.

Key words: Heading face, Cooling test system, Refrigeration cooling, Enthalpy difference, Cooling coefficient