This paper studies the petrological, geochemical and isotopic characteristics of Huashan granites. It has been identified that the Huashan granite body is a complex consisting of granitic rocks of three different independent stages, with different petrogeneses and different source materials. The first stage is the Triassic Niumiao quartz monzodiorite and Tongan quartz monzonite of crustmantle mixed type, with predominance of mantle source. It is emplaced by the differentiated magma from upper mantle and contaminated by crustal martials. The second ttage is the Jurassic Huashan main body granite, also of crustmantle mixed type, with a higher crustal source to mantle source ratio.Upwarping of upper mantle along the WE trending deep fault and remelting of heated crustal materials (including sedimentary component and igneous component) is its possible genesis. The third stage is the Cretaceous fine-grained granite stocks and apophyses of mainly crustal source. They are formed by partial melting, remelting or anatexis of crustal materials dominated by sedimentary component.