To enhance the performance of high-frequency filters used in the 5G era，a surface acoustic wave（SAW）resonator，based on the SMR structure，with X-37°Y LiNbO₃ as the piezoelectric substrate was studied. The influence of resonator structure parameters on performance was investigated by two- and three-dimensional finite-element simulations，whose results were verified through wafer fabrication. The results show that the resonator performance is optimal when the rotation angle in this structure is 37°，and increasing the tilt angle can enhance the suppression effect on the lateral mode spurious. However，when the tilt angle exceeds 18°，the effect weakens，and new spurious is introduced. The tilted small hammer structure can improve the quality factor（Q）of the resonator to a certain extent for the tilted structure. These results underscore the tilted small hammer structure with a tilt angle of 15°-18° as the best solution. This structure can balance spurious suppression and Q-value maintenance，providing design guidance for high-frequency SAW filters.