Abstract: Proppant conductivity test is commonly conducted with liquid media,of which the result aiming at reservoir fracturing becomes one of the new targets for study.Gas log conductivity test is conducted for the first time with the API proppant conductivity testing system according to the evaluation method of short-term conductivity test,as well as the comparative study of conductivities between gas log and liquid log is taken.It is showed that the propping fracture conductivity of gas log is 1.5 to 2.5 times higher than that of liquid log under the same testing conditions(such as haydite type,sanding concentration,temperature and pressure).A lower average sanding concentration in gas well fracturing should be adopted than that in oil well fracturing so as to obtain the same propping fracture conductivity.It will be more reasonable to use the result of gas log conductivity testing as the guideline for evaluation of potential before fracturing,optimization of fracturing design,forecast of effects and selection of proppants.The method of gas log conductivity should be used for laboratory research on fracturing of gas reservoirs.