Abstract: Contaminated product is an inevitable result in batch transportation in long distance product pipeline. Feasibility analysis was made for contaminated product s back tail treatment method, gave necessary condition to treat contaminated product and relative operation data for actual switchover of contaminated product. Analysis and comparison were made to the length of the contaminated product section with different concentration, summed up certain rules and put forward a concrete assumption of how to raise a back tail proportion of contaminated product. By taking South Product Transportation Pipeline for example, performed contaminated product's back tail treatment and got a certain practical experiment.