Abstract: The oil storages south of Yellow River's middle and down-stream ake up 60% of the total in China and there is handled the light oil covering 80% of the whole stroage of it.It is in a difficult state to load the tank cars with gassoline when the ambient temperature rises up to 33℃-84℃。Here in this article is presented a new unloading method-one point autosucktion。Its advantages lie in the fact that unloading is done one after another with a single arm having a submerged oil pump fixed at its top which pumps oil inside the tank car unaffected by the temperature around, There-fore the oil evaporation losses are reduced and unloading time shortened. The investment at one time will. be redueed by 40% in comparison with multi-loading arms, and managerial cost by 93%. It is concluded that it is feasible and economic to apply this method to the tank farm which the oil storages less than 10×10⁴m³ in capacity and the turnover rate 30×10⁴m³ per year.