The Qianlishan granite, which emplaced in the Sinian and Middle-Upper De- vonian eystems at the early stage of the Yanshanian movement (172-141Ma)， is a composite instrusive body. In instrusive sequence, it consists of fine-rainec porphyritic biotite monzonitic granite γ5(2-1)，medium to coarse-grained biotite monzonitic granite γ5(2-2)，fine-grained biotite monzonitic granite γ5(2-3)and granite porphyry (γπ). The Qianlishan granite is of magmatic origin. It has high SiO2 and relati- vely high A1 contents;Na2O/K20=0.5-0.9; 87Sr/86Sr=0.7328 and δ18O=+ 10.8%0 . The REE distribution pattern is of Eu-depleted type with intensive negative Eu- anomaly. Therefore, this intrusive body belongs to S-type granite. Based on the characteristics of its emplacement, the source rocks of the Qxanlisha.n granite might be Pre-Sinian sediments. From γ5(2-1) through γ5(2-2) to γ5(2-3) the evolution of magma shows obvious trend, i. e., the differentiation index (DI)，alkalinity, the IiREE content. anti they degree of Eu depletion become higher and higher; the contents of granitophile increase, whereas those of granitophobe elements decrease, but the granites of πγ doesn't follow these trends. Based on the above, it is thought that γ5(2-1),γ5(2-2) and γ5(2-3) are aslated to comagmatic fractional differentiation but γπ is not. Ju-dging from its mode of occurrence granites γπ probably came from a level dee-per than the others in origin.