Abstract: For the buried hot waxy crude pipeline running at low flux, the new best pigging period model is established based on old pigging period model, which consider paraffin deposit thickness. The model's economy object function has two variables, pigging period and paraffin deposit thickness. In the course of solving this model, the first step is to calculate oil pipeline unit transportation cost at given paraffin deposit thickness and pigging period, the second step is to calculate optimization pigging period at given paraffin deposit thickness using the halving way, and the last step is to determine the optimization pigging period and paraffin deposit thickness by means of changing the rest paraffin deposit thickness.