In order to meet the need of uniform pressure on the ball lapping plate of the new ball lapping machine with variable diameter groove,a kind of eccentric pressure fixed plate press plate was designed.By analyzing the functional requirements of the fixed plate pressure plate,the structural design scheme of the fixed plate pressure plate was proposed by using the method of association analogy.By using numerical simulation technology,the static and modal characteristics of the platen were analyzed by establishing the finite element model of the platen,and the deformation diagram,stress cloud diagram,natural frequency and vibration mode of the platen were obtained,which verified the feasibility of the design of the platen structure.According to the eccentricity of the fixed plate and the distance between the goal notch and the center of the plate,the optimization objective was to minimize the structural deformation and stress.Through parametric modeling and response surface method,the parameters of the platen were optimized,and the optimal structural parameters were obtained.The analysis results show that the maximum deformation of the optimized fixed plate pressure plate decreases and the pressure distribution is more uniform.Through the structural scheme innovation and the adoption of modern design method,the design requirements of new structural parts are realized.