As a transmission media of communication, optical fiber communication is widely used in people′s lives for its high transmission rate, large amount of information. Under this background, the band-pass filter film is made to satisfy the requirements for the laser communication system. Using Ta2O5 and SiO2 as coating materials, the bandpass filter which has five resonators is designed and the thickness of coupling layers are monitored by analyzing and solving the question of material stress match. The insertion loss of the filter is less than 0.3 dB at from1479 nm to 1504 nm and the transmission isolation is higher than 39 dB and 31 dB at from 1260 nm to 1450 nm and from 1530 nm to 1620 nm, which meets requirement of the system.