Abstract: The paper int roduced the result that the temperature rise anomaly of thermal-infrared ray in low er atmosphere before earthquake is closely related w ith the sunlight radiation, air elect ric field and air composi tio n.The higher non-polarity g ases such as CO2, CH4 composition is, the higher temperature rises.On the cont rary, the higher polarity g ases such as H2Og as composition is, the smaller the temperature rises.Fo r the air containing hig her CO2, CH4, i ts thermal IR radiation is much higher than that of ”g reen house” gases, the temperature rise is 10 C.

Key words: Gases anomaly, Radiation sources, Electric field, Temperaturerise