Abstract: Based on the analysis of tee physical, chemical and biological characteristics of breccia, the author suggests that the karst-collapse breccia from the Jialingjiang Formation of the Lower Triassic in the Middle Yangtze Area was developed during the time of Indo-Sinian and Indo-early Yensh-anian, i.e before the time of migration and accumulation of oil and gas. Consequently, the karst-collapse breccia of the Jialingjiang Formation is a favourable reservoir which should not be overlooked.