Abstract: Analysis and prediction of seawall foundation settlement are very important for engineering maintenance and disaster prevention, but there is no unified analytical model because of too many factors influencing the settlement. Based on the seawall monitoring data, the paper makes full use of the good fitness of Autoregressive Integrated Moving Average Model ( ARIMA) and dimension-fixed and cursion-compensated idea of Realtime Tracing Algorithm (RTA), and a new model named ARIMA-RTA is developed. As a test, the prediction model is applied to calculating a case of the seawall monitoring data, and the results show that the model has carefully- defined physical conception and thus opens up broad prospects for application to engineering data analysis for high precision and noise immunity.