Abstract: In order to provide the theoretical basis to the site technical operation and acquire the relationship between the emission law of the underground coal ga sified pollutants and the temperature of the coal gasified face, a test platform of the underground coal gasification model was applied to study the relationship between t he pollutant emission law, the temperature of the coal gasified face, gas thermal value and other parameters under the conditions of 10 L/h water influx and 35% oxyge n volume fraction.The study results showed that with the temperature increased of the coal gasified face, the emission value of the ammonia nitrogen, the electric cond uctivity and the pH value of the coal gas cooling water would be increased and the emission value of the COD would be decreased.The variation of the coal gas thermal value was the same to the variation of the gasifier temperature field.A quantitative relationship between the temperature zone distribution of the gasified face and the po llutants emission value was finally established.