Abstract: With 7 pump stations and 720 mm in diameter, the design transportation capacity of Daqing-Tieling Parallel Oil Pipeline is 45×10⁴ t/a. In the 7 pump stations, Chuiyang Pump Station, Lishu Pump Station and Changtu Pump Station are abbreviated to the South 3 Stations, in which 4 indirect heaters with 4650 kW are installed in every station. The operation state of heating system of the South 3 Stations shows that the outlet temperature of heat medium is higher than that of Daqing-Tieling Oil Pipeline, the original oil pipeline at same load. The analysis results displays that the lower throughput of the South 3 Stations (15×10⁴ t/a) results from the increment of heating load and outlet temperature of heat medium. The technical improvement on heating system is made according to the analysis results.