Abstract: Zhanggongshan area of Anhui-Jiangxi border region is located in the northern margin of the Jiangnan orogen. The large thickness and low greenschist facies metamorphism flysch formation rocks, containing argillo calcareous fine clastic rocks in main and a bit of volcanic materials, is widely distributed in the area. A mass of high precise isotopic dating shows that it may form in early Neoproterozoic between 821-840Ma, fringed by Jingdezhen-Zhangyuan-Fuchuan regional fault belt, and Xikou group-complex in the southern part caused by continental marginal tensioned construction; Shuangqiaoshan group in the northern part reflects the subduction volcanic arc tectonic sedimentary environment. The basic rocks such as alteration pillow-lump basic volcanic lava, gabbro, dolerite distribute NE-SW on the north slope in Zhanggongshan, which occur in the flysch matrix combined by Xikou group-complex volcanic-margin fine clastic rocks as shivers or splinters formation. The geological occurrence feature and petrogeochemistry analysis show that it is considered to form in low speed extensional margin small ocean basin-spreading ridge with initial oceanic lithosphere-basic rock feature, which belongs to westward extension part of Wannan Fuchuan ophiolite. Large amount of vitric crystal tuff and minor andesite, rhyolite occuring in Shuangqiaoshan group stratum as interlayer formation are similar with geochemical features, belonging to potassium-calcium-alkali rock series, and form in the margin volcanic arc tectonic setting. Sedimentary, magmatic and tectonic occurrences in comprehensive district bring that Neoproterozoic Anhui-Jiangxi border region has undergone the southeast ancient Yangzi plate margin split— continental margin small oceanic basin limited subduction—arc-continent collision orogeny—post continent crust rifting-sedimentation tectonic evolution process.