Abstract: It is important for safe operation to determine temperature field of crude oil pipeline well and truly.The mathematic model for solving unstable thermal and hydrodynamic problems in the process of batch transportation of cool and hot oil is established,and calculation software is also developed.As an example,the process of batch transportation of four types of oil in western crude pipeline is simulated by the calculation software.The calculation results show that the maximum difference under varied simulating time appears in the inlet of heat stations,i.e.the longer distance between heat stations,the longer time of simulation.The precision requirements of temperature field considering the operation time as a month can be satisfied.The effect of initial temperature filed on the operation course becomes weak with shorter distance between adjacent heat stations because the temperature error can accumulate in the inlet of stations.