The conglomerates developed in the Middle-Upper Devonian of the Fengxian-Shanyang area，Shaanxi Province, include mud conglomerates, dolostone conglomerates, ore conglomerates, and albite conglomerates. These conglomerates are closely associated with hydrothermal sedimentary bodies in space. Their petrochemical compositions were also affected by hot water activity. The petrological and petrochemical characteristics indicate that the formation of these conglomerates was controlled by growing faults during the metallogenic epoch. These growing faults not only resulted in the formation of the deep water basin where the conglomerates were deposited as a result of deep water mass flows, but also carrying heat flows for the mineralisation of these conglomerates. The lead-zinc deposits are products of the synsedimentary hydrothermal sedimentation. Through studying petrology and petrochemistry (including isotope dating) of mud conglomerates in the Chigou formation (D2ch), the author suggests that the hydrothermal ore deposit series (siderite-silver-multi-metal-gold deposits) in the Daxigou formation (D2d) are of natures of secondary hydrothermal sedimentation.