Integrated traveling-wave lithium niobate modulators need relatively large device lengths to achieve low drive voltage.To increase modulation efficiency within a compact footprint,we report an integrated Fabry-Perot-type electro-optic thin film lithium niobate on insulator modulator comprising a phase modulation region sandwiched between two distributed Bragg reflectors.The device exhibits low optical loss and a high tuning efficiency of 15.7 pm/V.We also confirm the modulators high-speed modulation performance by non-return-to-zero modulation with a data rate up to 56 Gbit/s.