To address the high transmission loss of Lamb wave resonators at frequencies exceeding 6 GHz, thispaper introduces an anchoring structure based on phononic crystal (PnC) arrays with distinct band gaps. This designeffectively enhances the quality factor (Q) of lithium niobate Lamb wave resonators (LWRs), thereby reducing theinsertion loss of Lamb wave filters. By constructing a finite element simulation model of the PnC structure, we analyzedthe dispersion relationship of the PnC structure. Utilizing a PnC delay line model, we investigated the transmissioncharacteristics of the PnC array. Through a comparative analysis of resonator performance, this study confirmsthat under stable resonance frequency conditions, the Q value of the resonator using PnC array anchors is increasedby a factor of five compared to traditional uniform beam anchor resonators.