In the existing prediction model, the difficulty in determining the parameters could result in the deficiency of prediction precision. A method for dynamically correcting the parameters of the prediction model was illustrated. Based on the distributed optical fiber sensing technology, the whole progress of the expansion was real time monitored. According to data obtained via distributed optical fiber sensing technology, the key parameters of analytical model and corrosion expansion rate can be inversely calculated, which can help establish the dynamic updating prediction model of the whole progress of the concrete expansion.