Lots of late Early Carboniferous to Middle Permian acid-intermediate intrusive bodies are outcropped on the northern margin of the North China Craton. Because of rare exposure of the contemporaneous mantle-derived basic-ultrabasic rocks, it is very difficult to obtain some information concerning the mantle compositions and processes in this area. For the better understanding of the nature of the source rock, the authors chose the representative intrusions, i.e., Gushanzi ultrabasic rocks, which are about one hundred kilometers away from the southern Inner Mongolian Axis, for zircon U-Pb dating as well as trace element and Lu-Hf isotope analyzing. The LA-ICP-MS zircon U-Pb age of Gushanzi ultrabasic intrusion is 296.9±2.6 Ma, which indicates an Early Permian magma activity. The analytical results show the characteristics of low content of trace elements, strong positive Ce anomalies, slight negative Eu anomalies and relatively low εHf(t) values of -1.9～-7.5 (n= 17) in the sample Gushanzi-B3, indicating the source of enriched lithosphere mantle. Both t_DM and t_DM^C are higher than the U-Pb age, implying that the source rock was contaminated by ancient crust during its formation. Compared with zircon εHf(t) (-17.0～-14.1) values of Boluonuo hornblende-bearing gabbro in the Inner Mongolian Axis whose rock-forming age is 297±1 Ma, zircon εHf(t) values of Gushanzi ultrabasic rocks are obviously higher, implying a less enriched origin of Gushanzi ultrabasic rocks. Additionally, zircon εHf(t) of the other two testing plots of Gushanzi ultrabasic rocks are 3.2 and 4.0, respectively, which implies that a small amount of depleted mantle-derived substance was added to the primitive magma. The authors thus infer the existence of a local tensional and thinning setting of northern margin of North China Craton during Late Paleozoic.