Abstract: Based on the methods derived from the project of "Study on anomaly recognition for ground water parameters and prediction methods",the well-network data of underground water level since 1983 in Hebei province are processed in the whole time and space range.The results show that the method of "yearly frequency method of group well anomalies"can detect obvious anomalies before medium and strong earthquakes in Hebei and its adjacent area,and has good prdiction effect.The R.value evaluation for its prediction ability is performed.The results show the fail rate for prediction is lower and the false rate is higher.