Abstract: There exists a least value of the sum of motive power and heating power consumption costs in pipelining heated crude oil. The heating temperature of crude oil corresponding to this extremum is called the econmical temperature. In practical prodictiono it is vayportari to detormine the economical temperature in order to uprate a yippline at the jovert power cost. Considering that the power consumption csot depends on many factors such as pipe diemeter, throughput, the interval between two pump station, soil tempereture, oil viscosity and heating temperature, here in this article the heating tenperature is merely taken as a function of the total power consumption cost with all the other parameters as constants,and from these a mathematical formula for economical temperature is derived when crude oil presents itself as Nusloniam fiuid. Through practical calculation of the basic parameters in respect of Dong Ying-Huang Dao pipeline, is brought about the curve of the economical temperature in rclation to throughput and soil temperature.