The observed data of water resources of a river is a time series, reflecting river evolution. The Rescaled Range Analysis is an effective tool toward analyzing time series. Thereby it was introduced to process and analyze the water resources data in this study. The mean yearly values of the water resources of the Yellow River from 1956 to 2004 and that of the main rivers in the Loess Plateau during this period are processed for furthering sight on their tend in the next years or decades. The results show that the Hurst exponents of the runoff of the YellowRiver and that of themain river in the Loess Plateau are less than 0.5,between 0 2771~ 0 3305. These values, with an enhanced trend, deviate from the normal variation of the long-distance correlativity, and an accretive trend is therefore forecasted.