In the large-size photograph and high-resolution film camera

film flattening is one of the most important technolgoies to the camera. In order to get high film flattening precision and high graphic quality

not only film flattening and releasing should be done well

but also vibration absorption and noise reduction should be designed well. In the paper a more perfect film flattening system is introduced. A calculation method about film flattening accuracy is presented. The effect of limiting vacuum of vacuum pump on the speed of film flattening is analyzed. The methods of vibration absorption

noise reduction and ventilation purification are described.