The experimental and theoretical study on the application of the modified θ projection equation to the remaining creep life assessment of 10 CrMo910 steel show that the predicted creep curves by modified θ Projection equation are in a good agreement with the tested creep deformation data. The thermodynamics theory has been used to clarify the relationship among the 3 parameters in the equation

the applied stress and activation energy. It indicated that the tested creep data at high stress could be applied to extrapolate the creep curve at low stress.The predicted Creep strain of the main steam pipe in Niangziguan power plant was in good agreement with its actual strain. The equation could also describe the relationship of actual deformation versus the service time. This could provide the theoretical basis for the pipe deformation monitoring.