This paper reports Pb, Sr, Nd, isotopic compositions of 8 granitoid plutons from Ningshan,South Qinling, which were all formed about 200 Ma B.P. The results indicate that the granitic rocks from these plutons are characterized by low radiogenic Pb isotopic composition. Initial (87 Sr/86Sr)tratios range from 0.70495 to 0.70908,εNd(t) values from -2.41 to -8.55, and Nd isotopic model ages (TDM) from 1.20 Ga to 1.71 Ga. From east to west,εNd(t) values gradually increase, whereas TDMvalues gradually decrease. This study reveals that the magmatic source of the Ningshan plutons was derived from the deep crust. In the magmatic source, basic magmatic material in the crust similar to Yaolinghe Group basic volcanic rocks (Pt3) in South Qinling is the major source for the formation of granitoids with less significant old continental crust material (Ar-Pt1). However, the proportion of the old continental crustal material in magmatic source increases from east to west. It is suggested that the deep crust of the Fuping Dome is mainly com- posed of Late Proterozoic basic magmatic material (Pt3) that was underplated beneath the Fuping Group (Pt1), but the old continental crustal material in the deep crust gradually increases from east to west in the Fuping Done. This indicates that the deep crust material displays east-west zoning and south-north structure, which is different from the ring distribution of surface-crust material of the Fuping Dome.