The Yanshanian Huashan-Guposhan granites in Guangxi are characterized by high silicon,high potas- sium,high alkaline,low phosphor and metaluminous nature,with relatively high FeO~T/MgO ratios and enrich- ment of LILE,HFSE and REE.In addition,they commonly contain allanites.They can thus be assigned to the high-potassium calc-alkaline granite(or KCG in the classification system of Barbarin,1999).They were formed during the conversion of the tectonic setting from compression to extension.The extension-thinning of litho- sphere,the upwelling of the depleted mantle,and the partial melting of the lithospheric mantle rich in phlogo- pite and K-richterite might have served as the principal factors in producing this kind of granitic rocks.