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The author studied the volcanic strata exposed in the central-southern Songliao Basin��including the lithological��lithofacies and assemblage characteristics of volcanic rocks��and analyzed the spatial distribution and eruption�� combined with drilling data�� The results showed that in the central-sourthern Songliao Basin mainly developed acid volcanic rocks with a few basic basalt��andesitic basalt and basaltic andesite�� Eruption patterns were mainly in burst facies��effusive facies and extrusion facies�� The types of reservoir space developed in volcanic rocks were primary pores��secondary pores and fractures�� The upper and middle subfacies of effusive facies��hot detritus flow subfacies of burst facies and volcanic conduic facies were better for finding the petroleum reservoirs��