Objectives: There are a large number of deformational granites at the junction of Anhui, Zhejiang, and Jiangxi province in the eastern part of the Jiangnan orogen. A lot of researches have been done by the isotope chronology and geochemistry on the granites. However, the structural deformation characteristics of the granites are little investigated. In this research, we focus on the deformational characteristics and geochronology of granites and their regional geological significant. Methods: On the basis of detailed field work, the structural analysis and LA-ICP- MS zircon U- Pb dating are carried out on the granites. Results: The granites distribute in NE direction and parallel to the northeastern Jiangxi deepfracture zone. A lot of structures, such as foliation and mineral lineation of mylonite, rotated porphyroblast and S—C fabrics, indicated that the granites had been suffered ductile shearing. Meanwhile, widely developed of the remnants of early magma flow, myrmekite and solid plastic deformation truly recorded the process of semisolid flow and deformation of the granites. The LA- ICP- MS zircon U- Pb dating results of two samples is 783±14 Ma and 780±12 Ma, indicating that formation of granites in this region is about at 780 Ma. These ages are in accordance with ages of regional metamorphic and deformation. Conclusion: The results show that the granites at the junction of Anhui, Zhejiang, and Jiangxi are syntectonic. They are affected by the ductile shearing in the process of magmatic emplacement—condensation. They are the products of the collision between Yangtze Plate and Cathaysian Plate.