Abstract: Laboratory simulating studies are made on shear rate of pipe flow for purpose of realizing long distance transportation of additive crude oil. The tests, with Xinjiang additive oil as sample, show that the shear rate is temperature dependent in the course of temperature decrease, and that an optimal shear rate exists which results in lowest viscosity. By analizing the oil flow and dividing it radially into bottom laminar zone, transitional zone and turbulent corne, it can be concluded from the measured shear rates that when the flow in pipe is small the shearing in transitional and bottom zones has an infuence on the flowa-bility of additive crude oil, while the shearing from turbulent corne also impacts oil flowability when the flow is greater. The method of equivalent shear history is introduced and its basic principle and application described for quantitaively understandung the impact of shearing on flowability at low pressure.