A new technology of Liquefied Natural Gas (LNG) pipeline transportation was paid more attention by the scholars. In this paper ,Peng-Robinson equation was adopted to calculate the thermal physical properties, the influence of pressure, temperature and phase change on LNG physical properties was discussed, and the pipeline transportation process was studied and analyzed in three states: super-cooled state, subcritical state and super-critical state, which could provide the theory basement for LNG long distance pipeline transportation.%LNG的管道输送技术作为一种新的LNG输送方式被越来越多学者的所关注。采用P-R方程迚行LNG物性参数的计算，幵讨论了压力温度以及相态的改变对LNG物性的影响；对LNG在过冷态、密相、超临界三种状态下管输工艺迚行了工况的研究与分析，提出了过冷输送、密相输送、超临界输送三种输送方案。为天然气液化装置、LNG装卸装置和LNG冷能利用装置的管道输送提供理论指导，为LNG长距离管道输送提供理论基础。
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