This study is related to the method of fixing a 0.1 mm film that can withstand a wind speed of 50 m/s and a withstand pressure of 0.01 MPa to an FRP rib in an agricultural greenhouse. Since the film is fixed to the conventional U-shaped steel by stress concentration in springback, the tensile strength of the film is not fully utilized due to breakage from the fixed part, but by making the fixed contact a rubber surface friction contact. It is clarified that it will be possible.