The application,design and preparation method of variable angle band pass filter film for visible light band are introduced according to thin film optics.Based on the principle of wave optics,the optical characteristics of the band-pass filter film and the difficulty of the variable angle are analyzed.Secondly,the main technical problems in the process of film selection,testing and process preparation at 0 ° to 33 ° incident are discussed.After optimization,the films with low absorption,small offset and good adhesion were obtained by optical control and ion assisted process.The film has been used in the terrain survey camera,and high-resolution image at variable angle was achieved.