The Niushan intrusion in the Fanchang volcanic basin located in the Middle and Lower Yangtze region, is a concealed graniteporphyry rock exposed by a drill. In recent years, the copper, gold,lead, zinc polymetallic mineralization closely related to this intrusion was revealed in exploration. LAICPMS zircon insitu analysis technique was used to determine the accurate age of this intrusion. The intrusion have large amounts of magmatic zircons characterized with high Th/U ratios and crystal ring oscillators, the weighted average 206Pb／238U age of 17 measuring points being (1218±19)Ma, belonging to the products of Late Cretaceous magmatism in the Middle and Lower Yangtze regions. The accurated dating and mineral discovery of the intrusion provide a new prospect for looking for copper and gold deposits in volcanic basins.