Abstract: Aiming at the low level automation and lots of human factors in the measurement and processing of slit film parameter, we introduced a novel film image reader. The light source irradiated the material to be scanned to complete the image acquisition and irradiated the CCD to achieve photoelectric conversion. The slit photographic film images were digitized and processed using software. The results show that the reader realizes large format （830 mm190 mm）color film image input. The platform structure and the precision of the transmission system ensure the all format precision of less than 0.1 mm, which is the measurement requirement, it can improve the automation of the film image reader, as well as the accurate measuring and processing of data.