Abstract: Based on the precursor mechanism of ground fluid, the corresponding relation in space and time between ground fluid anomalies and seismicity parameter are systematically studied. The results show that there is obvious spatial relation among the medium- and short term anomalies of ground fluid, seismic gap, weak earthquake belt and distribution of b value anomalies, and there is close temporal relation between the medium-and short term anomalies of ground fluid, minor seismicity frequency, band r; value. The results provide the basis that 1s of genetic significance for judging medium and short term anomaly indexes of hydrochemical parameter.

Key words: Ground fluid, Seismic activity, Precursor classification, Medium- and shortterm anomaly