Abstract: For the engineering and geological conditions at 411 working face of Longjiapu Mine, the underground local refrigeration system for cooling and dehumidification was applied. The results showed that: after three hours usage of the underground local refrigeration system, the working face average temperature dropped of 3.3 ℃ to 5.3 ℃ and the average humidity dropped of 11% to 17%; when the airflow temperature and humidity decreased, the average temperature drop and dehumidification effect would reduce; the underground local refrigeration system can make the temperature of the working face dropped to below 26 ℃, and the dehumidification effect is obvious.