The Neoproterozoic S-type granitic plutons, distributed along the suture zone of the Yangtze and Cathaysia blocks, play an important role in the tectonic evolution of the Jiangnan Orogeny.However, few researchers had focused on the scientific issues on the physical construction process of these plutons. Therefore, we carried out multidisciplinary approaches on the Sanfang and Yuanbaoshan plutons in the western Jiangan Orogenic Belt to figure out the construction mechanism of these plutons. Zircon Hf and U-Pb dating indicates that the magma, originated from the crustal partial melting, was crystallized at ca. 830 Ma. Field investigation shows that the plutons are dome shaped, and the bedding/foliation of the country rocks, the Sibao group, conform plutons boundaries and their inclinations gradually decrease away from the contact zone. A topto-the-E kinematic sense was observed in the eastern margin of Yuanbaoshan pluton. Both the textural analysis and AMS measurement reveal primary magmatic and secondary general top-tothe-W/NW post-solidus fabrics. The Bouguer gravity modeling reveals that the feeder zone probably locates in the southern part of each pluton and these two plutons are connected at depth.According to the primary magmatic fabric patterns, deep geometric shape as well as structural features of the country rocks, we propose that crustal partial melting magma probably intruded into the pre-existing mechanically weak (fold/fault) zone of the Sibao group, then lateral and upward accreted to construct the dome-shape plutons. The timing and mechanism of the postsolidus deformation are not well constrained, the interpretations are remain hypothetical.