The azimuths of the central principal axes of the dangerous sections on the frame of bulldozer are determined . the inertia moments to the central principal axes of the dangerous sections on the frame are calculated . this paper also determines the positions of the dangerous points and calculates the stress values of dangerous points on the dangerous sections 分析了推土机台车架在最危险工况下的受力状况，确定了台车架危险截面的形心主轴的方位、计算了台车架危险截面对形心主轴的惯性矩、确定了危险点的位置、计算了危险面上危险点的应力值。
