Abstract: The summarization and analysis have been made on the field testing of CE depressant used in Pu-Lin Pipeline. It is pointed out that the sampling pressure, pump shear.repeated heating at low temperature and final cooling temperature influence the effectiveness of depressant. The operating performance of the pipeline for the modified oil and the influence on paraffin deposit for decreasing the inlet temperature have been analyzed on the basis of the testing. It is considered that the optimal operating process, that is, one pump and one heater for the whole line, can be used in order to save energy. The economical benefits obtained by means of using CE depressant and the potentiality of energy saving under the existing transportation process have been analyzed.