The relativity between varied factors as the outlet oil temperature, oil density, flow rate, viscosity, specific heat capacity, buried temperature and running time after pigging and the overall heat transfer coefficient is studied in this paper with the characteristics of the physical properties of the overall heat transfer coefficient by four dimensionless numbers. The dimensionless  experimental is designed through loop experimental apparatus to ascertain the formula form of optimal predicted models and physical significance of each dimensionless number, and further put forward a new model, which is composed of dimensionless numbers, for the prediction of overall heat transfer . The result of forecast on oil pipeline in the Northeast indicates that the average relative error lowers by 2.85% over the inverse calculation, which solves the issue of large prediction errors due to fluctuation of running parameters.