Ore-bearing breccias commonly exist in lead-zinc deposits in the Sichuan-Yuanan-Guizhou border area. On the basis of a comprehensive study of the genetic classification of breccias and the field geological investigation in key deposits, the authors studied the features of ore-bearing breccias in lead-zinc deposits in the Sichuan-Yuanan-Guizhou border area. The results demonstrate that most of the ore-bearing breccias show features of extensional breccias, with compressional breccias seen in a few deposits. Through combining geological evolution of this area with the metallogenic epochs of the existing typical lead-zinc deposits based on isotope dating data, the authors roughly infer that there have existed at least two extensional tectonic events in this lead-zinc ore district since the middle Permian Maokou period.