本文介绍了１９９８年张北６．２级地震前水汞的异常变化；多点突跳、变化幅度大和持续时间长是震前水汞异常的特点。同时还根据以往水汞的多次震例，归纳出怀来４井水汞具有形态的多样性，对应距离为９０～２８０ｋｍ，异常出现后１５～４７天内发震等特点。从而加深了对该井水汞异常与地震关系的认识，有助于今后水汞预测地震水平的提高 In this paper, the anomalous changes of mercury in water before the M 6.2 M Zhangbei earthquake in 1998 are introduced. The characteristics of multi-point kicking, large variation and long duration are the characteristics of mercury anomaly before the earthquake. At the same time, according to the multiple earthquakes in the past, the diversity of water mercury in Huailai 4 was summarized, corresponding to the distance of 90 ~ 280km and the onset of anomaly within 15 ~ 47 days. Thus deepening the understanding of the relationship between this well mercury anomaly and the earthquake, which will be helpful to forecast the earthquake level of water mercury in the future