Abstract: The mechanical model of finite element vibration analysis about the automobile drive axle housing was built by using the CAD/CAE designing method and combining the probability fatigue strength analysis theory with the automobile vibration theory. The fatigue strength check and the fatigue life prediction about the automobile drive axle housing were investigated based on the probability calculation results of road spectrum random loading. Furthermore,the fatigue life prediction method of the drive axle housing was proposed based on the calculation result of the CAE random vibration. The result showed that the distribution of 1σ stress in the drive axle could be directly reflected the result of Random vibration when the vehicle was driving, the great stress distributed in the middle part of drive axle and the regions which were the larger upper and lower surface in the inner and the outer of the spring block of steel sheet.