The Songnen- Zhangguangcai Range Massif is located in the eastern Xing’ an- Mongolian Orogenic Belt. Influenced by the superimpositon and transformation of the Paleo- Asian Ocean and Paleo- Pacific tectonic system, the tectonic evolution of this area is extremely complicated. Hence, further study of the granite can help understand the tectonic evolution history of the Songnen- Zhangguangcai Range Massif. The Deyu fine- grained granite at the northern margin of the Zhangguangcai Range magmatic rock belt is composed mainly of quartz, plagioclase, K- feldspar, biotite, muscovite and amphibole, etc. Zircon LA- ICP- MS U- Pb dating yielded an age of 254±1Ma, suggesitng that the emplacement occurred in Late Permian. The granites from the Deyu pluton have high SiO2(71.26%~75.34%), moderate Al2O3(12.23%~14.71%), low MgO (0.33%~0.52%), with K2O/Na2O of 0.85~1.17 and A/CNK of 0.99~1.05, suggesting that they belong chemically to weak peraluminous, high fractionated high- K and Ca alkaline I- type granites. The grantie has the low REE content (∑REE=54.7×10-6~72.8×10-6) and distinctive differentiation of LREE and HREE (LREE/HREE=8.49~10.46), and obvious positive Eu anomalies (δEu=0.69~0.8). The Nb/Ta (10.42~15.12), Zr/Hf (33.77- 46.45), combined with the Sr- Nd isotopes (TDM2(Ma)=1330~1375Ma), indicate that the granite derived from the Mesoproterozoic source area in lower crust. Trace element characteristic shows enrichment of Th, U, Zr, Hf, and relative depletion of Ta, Nb, P and Ti, suggesting an active enviroment of continental margin arc. The tectonic discrimination diagram shows a convergence part between subduction and collosion. Combined with study of contemporary granite and metamorphic rocks in the area and neighboring areas, it can be concluded that the Deyu granite was the product of Late Permian magmatism at the end of the subduction of the Paleo- Asian Ocean.