国内外很多学者对大震孕育时期的地震活动特征已作过许多研究,本文试图在前人工作的基础上做些新探索,以寻求今后工作的方向.据前人总结,大震孕育期的地震活动有如下特征:①条带状分布:据我国地震工作者的研究,渤海、松潘、炉霍、大邑、马边等地震前,地震活动呈条带分布. Many scholars at home and abroad have done many researches on the characteristics of the seismic activity during the genesis of a large earthquake and this article attempts to make some new exploration based on the previous work to seek the direction of future work.According to the previous summary, Seismic activities have the following characteristics: ① strip distribution: According to the study of China’s earthquake workers, the seismic activity is distributed in bands before the earthquakes such as Bohai Sea, Songpan, Luhuo, Dayi and Mabian.