Abstract: The conductivity of oil product is very low so that the electrifying effect of static electricity is tory serious. The author made a practical test in the field on the conductivity of air-kerosene which had been filled with T1501 additives for electricity ressistance, in order to investigating the varied attenuation law of conductivity of air-kerosene during storage and transportation on site. The practical testing data shows that additives for electricity ressistance will be partly losed during storage and transportation, thus cansing the attenuation of conductivity of on product. But it has been proved that the minimum value after attenuation is still within the present allowance of conductivity set by the state.