Abstract: Change of underground water leveldy namic tendency for more thanone year may be anomalousone, when there is no increasing or decreasing in water quantity. It is the prerequisite for investigating the hydrogeologic environment, hydrodynamic condition and the change in water quantity for the recognition of underground water level'sdyna micanomaly. Under the background of anomalous tendency, the turning of dyna mic tendency forunderground water level is related to seismicity. Here we present some strong earth-quake examples occurred in recent years. These events show that the imminent anomalies before the earthquakes all had tendency changes. Therefore, thedetermination for short-termor imminent anomalies should be basedon tendency analysis.
The timedistribution forunderground water level's tendency anomalies and its immi-nent anomalies is in adefiniteorder. Analyzing anomalies and seismicity with sequence method and studying the relationship between the anomalies occurrence, development and seismicity is of significance for earthquake prediction.

Key words: Dynamic tendency, Hydrody namic condition, Short-termor imminent anomalies, Earthquake prediction