Much attention ispaid to petrologic recognition marks and distribution regulation of volcanic event stratain coal-bearing sequences of Taiyuan formation in the middle of North China. The resultsare as follows Volcanic event strata develop extensively in the coal-bearing sequences.Their lithologic types are dominated by vitric tuff, vitric crystal tuff and medium-finetuffy sandstone, and their genetic types mainly belong to complicated type of theairborne-water-carried and the airborne type. The positions where the volcanic eventstrata occur show a tendency of going upward from west to east in the studying area, whileFengfeng site, whether eastern or western, is far away from the volcanic sources. Both thewest part and the east part correspond to one volcanic source respectively, with theformer locating in Daerhanmingda of Inner Mongolia, while the latter in Kangbao-Weichangzone of Hebei.