The Lanqizhen garnet granite in the Longhua area is situated at the middle part of the northern margin of the North China Craton (NCC), which is associated with the Paleoproterozoic Hongqiyingzi complex closely in space. The rocks are composed of alkalifeldspar, plagioclase, quartz, garnet and less biotite. Zircon UPb dating indicates that the Lanqizhen garnet granite was formed in 1894~1878 Ma, belonging to midlate Paleoproterozoic. The contents of SiO2 and K2O of the pluton are 6409~7080 % and 364~573 %, respectively, which suggests that the rocks belong to the transitional series between highK calcalkaline and shoshonite series. The rocks have higher Al2O3 (1450~1613%) and lower CaO (125~327%) and Na2O (180~257%) contents, with the aluminum saturation index (ACNK) being from 107 to 134. All these petrological and geochemical characteristics suggest that the pluton belongs to Stype granite. The rocks have higher CaO/Na2O (>03) and lower Al2O3/Ti2O, Rb/Sr and Rb/Ba ratios, which suggest that the magmatic sources are claypoor, plagioclaserich psammitic rocks. Zircon Hf isotopic analysis further indicates that the psammitic rocks might be the weathering products of the Dantazi and Hongqiyingzi metamorphic complexes. The geochronological and geochemical characteristics of Lanqizhen garnet granite are similar to those of the Stypes granites in the khondalite belt to the west of the study area. Considering regional metamorphic and magmatic date on the northern margin of the NCC, it is suggested that the khondalite belt might extend eastward from Jining area of Inner Mongolia to north Hebei province.