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研究了唐山、松潘两次７级以上强震的水化学前兆场特征。结果表明，两次强震水化学前兆场有相似的特征。在震源区，水化趋势性异常和短临突变异常所占的比例大，远离震源区所占的比例小，且有逐渐减小的趋势；在震源区，水化趋势性异常起始的时间早，远离震源区异常起始的时间晚，趋势异常的形态均为逐渐升高。水化学前兆场的形成与区域应力场有关，但与震源应力场关系密切，可能起主导作用的是震源应力场。
The hydrochemistry precursory field characteristics of two strong earthquakes of magnitude 7 or above in Tangshan and Songpan are studied. The results show that the two precursors have similar characteristics. In the source area, the proportions of hydration trend anomaly and short-term anomaly are large, and the proportion away from the source area is small and tends to decrease gradually. In the source area, the hydration trend anomaly start time Early, away from the source area anomalous start late, the trend of abnormal morphology are gradually increased. The formation of hydrochemical precursory field is related to the regional stress field, but it is closely related to the source stress field, which may play a dominant role in the source stress field.