Abstract: Based on the experiment and study on lowering comprehensive treatment temperature for MaHuiNing pipelined oil, this paper discusses the influence of the oil characteristics, flow rate, shutdown and restart and heating cleaning period of pipeline on the pipeline' s operation after lowering comprehensive treatment temperature. Laboratory and field experiment results show that the oil flowability at low temperature is basically similar before and after the treatment, and it is feasible to lower the treatment tempesature to 75℃. An economic analysis is made on the operation process on the basis of the treatment method.