With the rapid development of 5G, the construction of high-speed optical communication network is extremely urgent. Lithium niobate modulator is an important part of signal modulation system in high-speed optical communication. Improving the performance of lithium niobate modulator is the basis of the further development of high-speed signal modulation technology. This paper embarks from the present situation of the application of lithium niobate electrooptic modulator, summarizes the various research institutions in recent years for lithium niobate modulator in all aspects of the improvement and research, compared the various improvement direction of the known research achievements, the advantages and disadvantages of several improving methods are discussed, and the corresponding experimental research is carried out, points out the new silicon-based integrated lithium niobate modulator is the prospect of further development.