Abstract: The film processor is a key equipment in darkroom processing stage of film radiographic detection technology. The film obtained after its processing is the sole medium for determining the detection results, and the film quality directly affects the detection result accuracy. Therefore, the correct use of film processor is the key for obtaining high-quality and qualified films. This article starts from the principle of film radiographic detection technology and combines the international aerospace Nadcap checklist requirements. The impact of film processor on film quality is discussed in detail from 8 aspects, including the material and cleanliness situation of transfer roller shaft in film processor, transmission speed, film development solution and its replenishment rate, developing solution temperature, drying temperature, darkroom environment, regular maintenance and servicing, and consistency verification of film processor. Through theoretical analysis and practical application experience, the following 5 measures were proposed to ensure that the film processor could produce high-quality and qualified film: the replenishment rate of film development solution, the control of developing solution temperature, the darkroom environment control, the regular maintenance and servicing of film processor, and the consistency verification of film processor.