Abstract: Based on siulamtion experiment of pipe flow shear and pump shear on PPD-added Daqing Crude Oil in TieDa Oil Pipeline, influence law of shear function on viscosity and set point of PPD-added crude oil with shear history and heating history is researched.Simulation result on pipe flow shear shows that influence of shear function on viscosity of PPD-added crude oil around 35℃ is most obvious; simulation result on pump shear shows that influence of shear function on viscosity of PPD—acdded crude oil at 38—40℃ is most obvious.In addition, shear temperature and shear time also remarkably influence the set point of PPD-added crude oil.