Turbidity current deposits of the middle Ordovician Lashizhong Formation well developed in Zhuozishan Area. Based on field work and thin section analysis, the lithotypes and its relationship have been studied, and five lithofacies and three submarine channel complex deposits have been identified. According to integrated analysis on sedimentary characteristics of channel complex deposits, a depositional model for the submarine channels of Lashizhong Formation is proposed. The study indicates that the lower submarine channel complex deposits mainly consisted of sandstones with fining and thinning upwards stacking patterns, resulting from obvious lateral migration and vertical aggradation of the channel complex, which probably located at the region of sinuous submarine channel；The middle and upper channel complexes consist of sandstones extending stably on the lateral side, both with the thin alternating layers of siltstones and shales in the upper part, resulting from vertical aggradation of the channel complex, which probably located at the terminus of channels.