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We study the dynamic characteristics of a quartz crystal resonator in thickness-shear modes with the upper surface covered by an array of cantilever micro-beams immersed in liquid.The liquid is assumed imcompressible, irrotational and inviscid for simplicity.Interaction with surrounding liquid causes additional dynamic forces on the beams which are assumed to be linearly elastic.The dynamic equations of the coupled system is established and the added mass effect of liquid on micro-beams is discussed in detail.The characteristics of frequency shift are clarified for different liquid heights.Modal analysis shows the drag effect of liquid has resulted in change in phase of interaction (surface shear stress) and thus, has altered the system resonant frequency.The obtained results are useful in resonator design and applications.