In order to study the static characteristics of the journal gas bearing with R134a as the working fluid used in refrigeration compressor,based on the Reynolds equation of fluid lubrication,the gas bearing was modeled and analyzed through theoretical assumption.The calculation of the threedimensional gas film flow field was carried out by numerical analysis,and the characteristics of the gas film pressure distribution,gas film thickness distribution,bearing capacity and stability of the dynamic pressure bearing were obtained.The calculation results were compared with those of the journal gas bearing with air as the working fluid.The results show that under the same conditions,the bearing capacity of the gas bearing with R134a as the working fluid is smaller than that with air as the working fluid,and the bearing capacity of both is increased with the increase of the eccentricity,bearing clearance and rotating speed.Therefore,the gas bearing with R134a as working fluid should design a larger eccentricity and bearing clearance compared with the gas bearing with air as the working fluid.The stability of the qualitative system with R134a as working fluid is worse than that with air as the working fluid,and the stability of both systems tends to be stable as the eccentricity and speed increase.Therefore,the gas bearing with R134a as working fluid should design a larger eccentricity compared with the gas bearing with air as the working fluid.