The bed as an important support is the basis of the entire machine tool. The rigidity and stability of the bed will directly affect the size and surface accuracy of the workpiece. The natural frequency of the bed is an important parameter for evaluating the dynamic performance of the grinding machine. Increasing the natural frequency of the bed can effectively increase the structural rigidity of the bed. After the modal analysis of the bed, it visually shows the weak links in the design stage of the structure. The natural frequency of the bed could be increased by improving its structure. The optimal improvement results of grinder bed body was obtained by comparing different improvement schemes, which provide a theoretical basis and engineering reference for the subsequent structure design of the grinder bed.