It is very important to forecast the heat drop of the crude oil in the pipeline and the change of soil temperature field around underground pipeline for majoring pipeline construction and drawing up science and reasonable crude oil transportation craft. For increasing the accuracy of estimate, the various influencing factor of outside pipeline environment and inside pipeline oil temperature etc was considered. The drop of the crude oil in the pipeline and the temperature field of soil around different embedded depth pipeline in the process of hot crude oil transportation was numerically simulated by using heat transfer model with finite elements method, the drop of the oil in the pipeline and the soil temperature distributions around pipeline at different time were obtained in different embedded depth. Through the calculation results, different embedded depth of underground pipeline and oil-line time influence inside pipeline oil temperature. When majoring pipeline construction and drawing up the craft of hot crude oil transportation, the effect should be considered.