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A novel thin-film lithium niobate[TFLN]electro-optic modulator is proposed and demonstrated.LiNb03-silica hybrid wave-guide is adopted to maintain low optical loss for an electrode spacing as narrow as 3 pm,resulting in a low half-wave-voltage length product of only 1.7 V·cm.Capacitively loaded traveling-wave electrodes are employed to reduce the microwave loss,while a quartz substrate is used in place of a silicon substrate to achieve velocity matching.The fab-ricated TFLN modulator with a 5-mm-long modulation region exhibits a half-wave voltage of 3.4 V and a merely less than 2 dB roll-off in an electro-optic response up to 67 GHz.