Abstract: A theoretical analysis on the properties and laws of wax deposit for Dandong Sinuiju oil pipeline that operated under overlow throughput for years has been made. To meet the needs of overlow throughput operation mode, several technical measures, such as increasing pressure, dissolving wax with hot diesel and hot water, injecting PPD, pigging wax at terminal pipe section and intermittent transportation process, have been successfully adopted in this pipeline. The operation availability under overlow throughput for this pipeline is described. The authors consider that the successful experience in overlow throughput operation can be used by other pipelines.