Abstract: Contamination treatment is one of the key links of operation management for long-distance products pipeline. Based on the method of mixing some or all contamination back to the pure oil, according to the quality control indicators and testing methods regulated by GB 17930-2006 motor gasoline and GB/T 19147-2003 motor diesel fuel, combined with the actual operating situation of batch transportation pipeline in China, a mixing experiment of batch transportation oil is carried out for the particular pipeline. The results show that in diesel mixed with gasoline, the most sensitive quality item to mixing proportion is the closed flash point; in gasoline mixed with diesel, the significant influence on quality item is final boiling point, research octane number, anti-explosion index, and the sensitivity of the final boiling point is the most prominent. According to the testing results, critical mixing proportion calculation formula available for the actual production is recommended with the sensitive quality item as the control target.