Based on X-cut lithium niobate resonator with Bragg reflector structure （SMR）, the effects of in-plane rotation angle and Al electrode thickness on electromechanical coupling coefficient（K²）, phase velocity, and impedance ratio were simulated and calculated via finite element （FEM） simulation. We constructed a three-dimensional finite element （3D FEM） structure to investigate the relationship between transverse modes and half wavelength within the resonator band and compared the suppression effect of transverse modes between two types of piston structures. However, the effect was not significant. Then three weighted resonator structures were proposed, namely weighted without dummy fingers, weighted with dummy fingers, and weighted with hammers. Subsequently, the performance of ordinary resonators was compared with three types of weighted resonators via experiments. The results show that the electromechanical coupling coefficient of the three weighted resonators exceeds 15%, and the impedance ratio is approximately 60 dB, which has a significant inhibitory effect on the transverse modes within the band.