Abstract: lt is significant to establish viscosity-Temperature mathematical modal of mixed crude oil for dasign and management of oil pipeline.In allusion to the situation where there is no generally adaptable viscosity-temperature mathematical model in calculating viscosity of mixed crude oil at present, viscosity-temperature mathematical models for mixed crude oil reported in literatures at home and abroad are comprehensively analyzed.Mathematical expression and its applicability for semi-logarithmic modal.Cragce model and double logarithmic are introduced and recent relative research achievements are stated; viscosity-temperature mathematical models for mixed crude oil with temperature influence parameter.Bergman and Sutton viscosity-temperature mathematicaI models for mixed crude oil as well as the mathematical model to reflect relative density, molecular weight vs Watson K characteristic constant are brought in.Research suggestion to improve the computing accuracy and applicable scope of viscosity-temperature mathematical models for mixed crude oil is presented.