This paper accurately simulated the properties of laddertype surface acoustic wave (SAW) filters composed of resonators employing relaxorbased ferroelectric single crystals. Firstly, the working principles of laddertype SAW filter was introduced, and then a simulation model of seven stepped filter was established by utilizing the quite universal simulator (QUCS). The simulated results showed that an extremely large wideband SAW filter of 620 MHz at 1 GHz could be obtained by utilizing such new single crystals, which is presently three times larger than that of the conventional piezoelectric material; the band rejection and skirt steepness could be improved by adjusting static capacitance ratio and modification of the conventional laddertype filter, but sacrifices some bandwidth; the influence of qullity factor on the insertion loss of SAW filters was discussed finally.