本文主要分析了1999年11月29日岫岩偏岭5.6级地震前，辽河盆地内7口观测井的前兆异常特征。观测项目有水位、采液量、采气量及套管压力等。这次地震前这7口井的观测资料均出现明显的趋势异常和短临前兆异常，并且具有较好的同步性。异常形态多数表现为升-降-升型。油田抽水、注水、采油、采气及大气压、固体潮等干扰因素对观测资料没有影响，异常是真实可信的。 This paper mainly analyzes the anomalous precursory features of seven observation wells in the Liaohe Basin before the M5.5 Xiuyan earthquake on November 29, 1999. Observed projects have water level, liquid production, gas production and casing pressure and so on. Before the earthquake, the observation data of these seven wells showed obvious trend anomalies and short-term precursory anomalies, and had good synchrony. Abnormal morphology mostly manifested as rising - falling - rising type. The interference factors such as pumping water, water injection, oil recovery, gas recovery, atmospheric pressure and solid tide have no effect on the observed data, and the anomalies are true and credible.