Abstract: The paper summarizes the development and actualities of gas-liquid two-phase transportation technology at home and abroad, analyzes the features of two-phase transportation process. Combined with the Alliance pipeline jointely-constructed by U.S. A. and Canada that adopted two-phase transportation process in its design, the author puts forward the application feasibility of two-phase transportation technology in China's long distance gas transmission pipeline, and some technical problems to be solved in two-phase transportation process.