ARIMAmodel is a kind of time series prediction model which possesses high precision.Based on the econometrics software Eviwes5.0 and total social investment in fixed assets data of Jilin Province in 1980-2005,the economic model ARIMA(3,1,2) is established to perform the prediction analysis on the total social investment in fixed assets of Jilin Province in the future.It is a good solution to the modeling for non-stationary time series.