The shortwave-pass cutoff filter (SWPF) can be used into the community antenna television (CATV) to restrain and distinguish diverse signals. It is the important component in the CATV transmission systems. The film is studied in order to reduce the transmission noise and improve the quality of signals. On account of the demands for parameters of the cutoff filter during the transmission systems, the suitable material of the thin film is determined. The testing results are gained from the equivalent model of the film. The light-operated tooling values of the coating materials and the thickness of the specifically higher sensitive film are adjusted. Conclusively, the mismatching of the film is removed during the coating process. The SWPF with less layers is fabricated. The reflectance is less than 1% from 1100 nm to 1360 nm, while the transmittance is less than 0.08% at 1490 nm ±20 nm and the transmittance is less than 0.05% at 1550 nm±20 nm. It is found that the film can meet the requirements of CATV transmission systems.