The　Shimian　Neoproterozoic　plutons　are　located　on　the　western　margin　of　the　Yangtze　Block　and　are　important　for　reconstructing　the　tectonic　environment　of　this　region.　We　present　in　situ　zircon　LA-ICP-MS　U-Pb　geochronological　and　Hf　isotopic　analyses　for　the　plutons,　as　well　as　whole-rock　major-　and　trace-element　compositions.　The　monzogranite　and　syenogranite　yield　concordant　ages　of　773.6　+/-　5.6　Ma　and　812.2　+/-　1.8　Ma,　respectively,　which　indicates　that　they　formed　during　the　Tonian　of　the　Neoproterozoic.　The　samples　have　very　similar　geochemistry,　with　high　SiO2(71.45-75.46　wt%)　and　Al2O3(12.38-14.36　wt%)　contents.　The　samples　have　a　geochemical　characteristics　typical　of　peraluminous　A-type　granites,　including　high　Ga/Al　and　Rb/Sr　ratios　and　elevated　contents　of　high-field-strength　elements.　The　samples　also　display　high　Rb/Sr　(13.9-23.0)　and　Rb/Nb　(12.5-19.2)　ratios.　The　monzogranite　and　syenogranite　yield　positive　epsilon(Hf)(t)　values　(+1.6　to　+9.4　and　+　5.2　to　+9.8,　respectively)　and　T(2DM)ages　of　1.54-1.22　Ga　and　1.51-1.21　Ga,　respectively,　which　indicates　that　they　were　derived　from　partial　melting　of　Mesoproterozoic　crust　or　contamination　with　upper　mantle.　We　propose　that　the　syenogranite　and　monzogranite　formed　in　a　syn-orogenic　extensional　setting　during　the　Tonian　period　and　that　continuous　subduction　was　responsible　for　the　Neoproterozoic　magmatic　activities.