In order to ensure national energy security, the exploitation of oil and gas resources in deep sea waters in China has proceeded smoothly.It is necessary to accelerate the research on multiphase flow waxing technology in submarine mixed pipelines, and to construct oil and gas multiphase mixed pipelines that can simulate the on-site production environment.Through the analysis of wax deposition mechanism and model, and the summary of typical multi-phase wax deposition equipment for mixed pipelines around the world, the shortcomings of existing seabed multiphase flow mixing equipment for pipeline waxing research are reported.It is clear that the construction of onshore high-pressure and large-diameter pipelines simulates real deep-water production systems, and guides the important value of engineering design and production operation of deep-water production systems. The existing wax deposition thickness is briefly introduced.