This paper presents a design method for wideband temperature-compensated surface-acoustic-wave filters. By analyzing the effects of varying Euler angles of LiNbO₃ substrates, distinct electrode materials, and thicknesses on the surface-acoustic-wave resonator frequency response and spurious wave suppression, the most favorable Euler angles and electrode configuration for a wideband temperature-compensated surface-acoustic-wave filter are determined. The fabricated wideband temperature-compensated surface-acoustic-wave filter exhibits a temperature coefficient greater than -18.9 × 10^-6/°C, a -3 dB relative bandwidth of 7.84%, and an insertion loss of 0.93 dB; additionally, it demonstrates effective out-of-band rejection.