The Taohekou Formation is constituted with volcanic, volcaniclastic and sedimentary rock. Based on the systematic field work, which including 1:10000 field survey and large scale profile drawing, it could be distinguished twentytwo lithofacies and then grouped into five lithofacies associations from the deposits. According to the comparative studying among different sections, we summarized the generalized succession of the volcanicsedimentary deposits, which to top is basalt facies(lower is massive basalts, upper is pillow basalts), tuff breccia, resedimented pyroclastrich (or pyroxenerich) lapillistone facies, structureless or imbricate tuffaceous conglomerate facies, tuffaceous sandstone facies(locally interbedded with calcarenite), biolithite or mudstone facies. The intensity of volcanism of west area is more powerful than the ones of east area. The type of eruption is Strombolian. The succession of Taohekou Formation, combines with geochemical of volcanic rocks or pyroxene, suggest that the tectonic setting of Taohekou Formation is ocean islands or seamounts, caused by within plate stretching.