In view of the demand of the miniaturized dual band SAW filter, the design technology of SAW filter with two ports and two passbands is studied. By building a dual band SAW filter acoustic-electric co-simulation platform including two groups of coupled mode (COM) parameters, the performance of the filter is analyzed and optimized. A dual-passband SAW filter packaged in CSP2520 has been successfully developed. The center frequency of the filter is 1 995 MHz and 2 185 MHz respectively, the passband bandwidths are both 40 MHz, the insertion loss is less than 3 dB, and the isolation between passbands is greater than 30 dB. The test results are consistent with that of the simulation.