The principle, design and fabrication process of the high overtone bulk acoustic resonator (HBAR) which can generate the combspectrum signal with the operating frequency of about 10 GHz at UHF band are presented in the paper. Also, the resonator with Au/Cr/ZnO/Au/Cr/YAG/Cr/Au/ZnO/Cr/Au twoport structure is designed, and theQ value of experimental sample is more than 23 000 at the resonance frequency of 2.240 137 GHz. The future work will focus on ZnO film growth, HBAR design modification and Q value improvement.