Neocarchean granite is widely developed in Liujiang area, eastern Hebei Province, which is the key to solving the study of the formation and evolution of the early continental crust in the east of North China Craton, so it has recieve considerable attention. This paper studies the geological, geochemical characteristics, zircon U- Pb dating and Sr—Nd isotopic geochemistry of biotite monzogranite in Liujiang area, to constrain determine its origin and geotectonic significance. The rock formation age of (2559±25 Ma) was obtained by LA- ICP- MS zircon U- Pb dating, emplaced during the late Neoarchean; the geochemical analysis of the whole rock shows that it is peraluminous, high- K cale- alkaline series, enrichment of large ion lithophile elements (LILE, for instance: Rb, Ba), loss of high field strength element (HFSE, for instance: Nb, Ta, Ti). The right- leaning distribution pattern with light rare earth enrichment and heavy rare earth loss, the Eu abnormalities are not obvious; \[n(87Sr)/ n(86Sr)\]i values range from 0. 701172 to 0. 701412, the \[n(143Nd)/n(144Nd)\]i values range from 0. 509341 to 0. 509375, characteristics of εNd(t) value of 0. 4~1. 1. Combined with the previous studies, we proposed that the biotite monzogranite in this study has the typical geochemical characteristics of I- type granite. There is the addition of mantle source material in the magmatic process, which is formed in the island arc environment after the arc formation of the active continental edge—land collision.