Abstract: To meet the needs of safe, economic operation of blended crude oil pipeline transportation between Zhongyuan Oilfield-LuoYang Refinery(Zhong-Luo Pipeline)after flow direction change, rheological parameters with different blended ratio of import oil and ZhongYuan Oil are measured.Resultsshow that the pour point of blended oil is still 14℃, although the blending ratio is at 4:1, which can not ensure the pipeline running at ambient temperature transportation all year long. Based on the physical properties of blended oil, pour point and viscosity models such as linear model, Liu TianYou Model Ⅰ and Ⅱ, Li Chuangwen Model etc are selected. Among them, Li Chuangwen Model has the minimum difference with maximum predicted difference 1.5℃. Modified Bingham model Ⅱ has the smaller calculation difference of average predicted difference 6.6% and maximum 22.1%, among the 14 models.