Design of distortion simulation board is an economic and efficient way to solve the matching problem between the inlet and the combustor of the ramjet. A method of designing the distortion simulation board for the ramjet combustor is put forward and proved by experiment. The results show that an orifice plate with nonuniform holes of design can serve as the distortion simulation board, and the simulation flow field is in good agreement with the target flow field. The method is applicable in experiments and design of ramjet combustors. © 2016, Editorial Department of JOURNAL OF EXPERIMENTS IN FLUID MECHANICS. All right reserved.