Abstract: Wulanhada pluton, located in Xianghuang Banner of Inner Mongolia, belongs to the middle section of the northern edge of theNorth China Craton (NCC). It is mainly composed of middle-fine to middle-coarse grained alkali-feldspar granites. LA-ICP-MS zircon U-Pb dating indicates that the pluton was emplaced in the middle Permian (265.1Ma±1.5Ma, MSWD=1.5). These granites have high SiO2 (73.63%~75.47%) and are enriched in alkali (Na2O+K2O=9.25%~9.49%), belonging to high-K calc-alkaline rocks as shown in the plot of SiO2-K2O. They are weakly peraluminous with ACNK of 1.00~1.03. The Wulanhada granites show high REE content (94×10-6~383×10-6) and are relatively enriched in LREE ((La/Yb)N=6.59~13.20), with evident negative Eu anomalies (δEu=0.22~0.38). Their trace elements are characterized by distinct negative Ba, Sr, Nb, Ti and P anomalies, with high HFSE content (Zr+Nb+Ce+Y>350×10-6) and relatively high 10000×Ga/Al ratios (2.36~2.79). In conclusion, the Wulanhada alkali-feldspar granites show typical A-type geochemical affinity. Furthermore, the relatively low Nb content implies that the pluton is A2 subtype granite. Based on the plots of R1-R2 and Y+Nb-Rb, the authors hold that the pluton was probably emplaced in an extensional post-collision setting. The results obtained by the authors suggest that the collision between NCC and Siberian Craton took place as early as 265.1Ma.