The U-Pb ages of zircon from Cishan granite were determined by LA-ICP-MS (Laser ablation-inductively coupled plasma_mass spectrometer). The ages of 199～149 Ma from 8 grains indicate the Jurassic formation of the granite, which can thus be termed Yanshanian granite. The ages of 2 110～2?467 Ma (2 252±41 Ma in average) from 4 grains of Early Paleozoic inherited zircon show that the source of the granite contains materials from Early Paleozoic Fenzishan Group. The formation ages of the granite provide important evidence for the origin of the Nanzhangjia gold deposit.