There are a good deal of factors that affect the leakage in town water distribution pipeline. According to analytic hierarchy process, the paper identified primary reasons for leakage. Based on this conclusion, multiple linear regression models were used for prediction of the initial leakage time after the supply net came into use. Then, double exponential smoothing model was utilized to forecast leakage time in the following years. Thus perfect time-prediction models for water supply network leakage were set up.