Abstract: Technology property of multiphase mixing transportation for offshore pipeline is introduced and study actualities of related process for the pipeline is described from flow pattern recognition, pressure drop law, temperature drop law and simulation calculation. Direction in study and development of multiphase mixing transportation for offshore pipeline is discussed, including development of multiphase booster pump, simulation calculation of pressure drop law and temperature drop law, solution to slug flow and hydrate and 1ong-distance multiphase mixing transportation as well.