With the increase of the transmission efficiency of the communication system, the bandwidth of the filter is required to be wider and wider. If the conventional SAW filter design technology is used, it will face the problem of high loss or insufficient bandwidth. Based on the development of a series of wideband SAW filters, this paper summarizes the design methods of wideband SAW filters with a relative bandwidth of more than 8% by using LiTaO3 piezoelectric substrate with special technology. These methods include using peripheral inductance and capacitance to increase the difference between the resonant frequency and the anti-resonant frequency of the SAW resonator to improve the bandwidth of the impedance element filter, using multi-mode longitudinal couple resonance structure to increase filter bandwidth, and using dual-pass filter parallel structure to obtain large-bandwidth filter. Each of the described methods has advantages and disadvantages, and the achievable bandwidth is about 9%.