本文通过对历史地震资料的分析,选取12个特征作了描述华北地震区的各不同时期的地震活动图象,并以1515年至1900年华北地震区内7级以上地震和6级地震的发生时段作为样本,用模式识别方法,分二次识别过程分析了7级地震和6级地震前的异常特征,取得了描述7级和6级地震的异常标志,并由此对未参加识别的1951年至1984年的地震活动作出预测,得到了与实际比较一致的结果。 Based on the analysis of historical seismic data, 12 features are selected to describe the seismic activity images of different periods in North China earthquake area. Based on the occurrence of earthquakes of magnitude 7 and magnitude 6 in the North China earthquake area from 1515 to 1900 Period as a sample, pattern recognition method was used to analyze the anomalous features of MS7 and MS6 before secondary recognition process, and the anomaly of the MS7 and MS6 earthquakes was obtained, and the 1951 Earthquake events from 1984 to 1984 were predicted and the results were consistent with the actual ones.