Research conclusions: The settlement of the pier and abutment of Yunlianghe Bridge of Harbin—Dalian Passenger dedicated Line becomes stable．With the metabolic GM(1，1)model of gray system，the prediction model for accumulated settlement can be established easily because of needing a little measured data．Although there is a certain gap between the predicted data and the measured data，but the prediction model can reflect the change trend of the settlement at the observation point and the approximate settlement volume at t}le observation point can be known before the next observation，80 the prediction model is significant in prediction of the settlement．In addition，the prediction model has a high accuracy and it can be used for prediction of the accumulated settlement．