Abstract: The traditional sea-crossing pipeline installation is made mainly by roller supports of steel structure, which has not only high cost and a long construction period, but also high maintenance costs. In order to effectively avoid the disadvantages and based on the characteristics of PetroChina Sea-crossing Transmission Pipeline in Jiangsu LNG Project, sliding supports, fixing piers, fixing supports, pipeline bearings and square compensator were designed and developed. This paper introduces the overall layout of pipeline supports and the design situation of four components of pipe support (fixing pier, fixing support, pipeline bearing and high-performance polyethylene sliding support) and gives the type selection and compensation calculation for compensators. Application show that the compensator can effectively compensate for the thermal elongation of pipelines, and pipeline support technology is available, low-cost, and easy to implement and maintain. This technology can provide a reference to the installation project of other big span aerial pipelines.