Abstract: Since the difference of gas-liquid phase physical properties, the mutual action between gas and liquid, and under the unsteady operations, such as shutdown, restart, slugging, pigging, inlet flowrate sudden changes, waves will occur in the oil-gas transportation pipelines. All these waves can be divided into three categories: density wave, pressure wave and interfacial wave. Different waves quicken fluids flow, enhance the momentum and energy transfer, and bring great changes to the heat and mass transfer and flow patterns, which will cause potential safety hazard to the pipeline transportation systems and downstreamtreatment facilities. This paper reviews the achievement on the research of the density wave, pressure wave and interfacial wave, which will give a valuable reference for the future research on the transient two-phase pipeflow.