Abstract: Aiming at the mechanics problem during the manufacture process of curving sandwich structure, the changes of the bending stiffness were analyzed, the forming theories were explained and the calculation formulas of bending stiffness were found. By discussing the calculation method of the forming pressure about the microcurving rate curving sandwich structure and using the plate theory, the calculation formulas of the forming pressure about the microcurving rate curving sandwich structures, including the examples and the results were deduced. After discussing the calculation methods of the spring-back about the curving sandwich structures, the calculation formulas of the spring-back about the curving sandwich structures and the results of the calculation examples were presented. Based on the characteristics of the deformation about the common honeycomb, the flexibility honeycomb and the micro-turss structures, the principles of choosing the curving sandwich structures core were also presented.