The linear moment theory of shells is applied to the analysis of bending displacements and stresses in disks with the membrane displacements and stresses obtained from the non linear membrane theory of shells as the initial states.According to the results of analysis,it can be confirmed that,the bending stresses in the disks play important role in disk selection but the bending displacements are negligible in comparison with the membrane ones.Hence in disk analysis,it is reasonable to determine the displacement field by nonlinear membrane theory and it is also both feasible and necessary to solve the bending stress firlds with linear moment theory.