Abstract: In this paper, the water-radon observable data of No. 1 Liaocheng ancient well in twelve years have been processed and analysed by the correlative average method and the average method. We have both qualitatively and quantitatively described that the normal dynamic behaviors of the yearly waterradon data of No.1 Liaocheng ancient well is similar to straight line. And from this well's hydrogeochemistry background, we explained the mechainism to decide whether the water-radon data are anomalous, and provided the evidence to predict earthquakes in native area or nearby areas.