Pressure coefficient of corrugated cardboard(γ) is the key technological parameter of corrugated cardboard production line, and the selection and setting of the parameter directly affects the physical performance of corrugated cardboard and the enterprise's economic efficiency. The pressure coefficient of A type corrugated cardboard was solved according to design principle and corrugated roller type combined with the prescription in the national standards GB/T 6544-2008. The production costs of corrugated cardboard with upper and lower limit of pressure coefficient was compared and analyzed. The performance difference of A type corrugated cardboard with large γ difference was compared. Suggestion on pressure coefficient selection and setting was put forward.