Based on a five IDT with longitudinal coupling structure, a SAW filter with centre frequency of 232 MHz and 3 dB bandwidth of 23.5 MHz has been developed on 41°-YX-LiNbO3 substrate by optimizing the design technique. The developed filter has the features of insertion loss of -3 dB, fractional bandwidth of 10.1%, and shape factor of less than 2.5 and the out of band rejection of more than 40 dB. The production has excellent specifications and practicality.