Abstract: Qinhuangdao-Beijing Oil Pipeline is closely running at the minimum specified throughput, and its flow safety issue is of great concern. In the light of lacking of quantitative evaluation results, the safety evaluation of shutdown and restart for QinhuangdaoBeijing Oil Pipeline operated under the conditions of current throughput and the allowable shutdown time is carried out by means of the crude oil pipeline shutdown and restart congelation probability calculation software, and the suggestion on reasonably distributing safety margin between stations is put forward. Besides, the flow safety evaluation results and the feasibility in optimizing process parameters between stations are discussed. The safety for most of the stations in Qinhuangdao-Beijing Oil Pipeline are satisfactory from most of months to the year, and the reasonable allocation of safety margin can be made by reducing the inlet temperature or extending the shutdown time and other methods. The results can provide a guaranty to the economic transportation for Qinhuangdao-Beijing Oil Pipeline under the precondition of flow safety.