The Caledonian anatexismagmatism activities in the Wuyi mountains region occurred commonly in Caledonian or close Caledonian, but precise starting time is still unknown. The Qishan granitic pluton is located in the southern part of the Wuyishan tectonic belt, and precise dating data for the formation time of the pluton is still absent. Two phase zircons were found in the Qishan granitic pluton, with early zircon being anatexis in origin and the other zircon being magmatic in origin. Using zircon LAICPMS UPb dating method yielded an forming age of 445～440Ma for the later zircon from the Qishan granitic pluton, which displays a new change rule that the ages are gradually younger from outside to inside. Our study shows that the pluton formed during the Late Ordovician to Lower Silurian and was likely the product of different magma intrusion from source region, i.e. the product of anatexis ceremonies magmatism activities. A weighed age of 458±4Ma obtained for zircons from the rim and center of the pluton is basically consistent to the weighted age of 460±4Ma for magmtic zircons, with the deviation within error range. Out study suggests that an anatexis activity occurred in the Wuyi Mountain region at early Caledonian around 460 Ma, which provided new constraint for the start timing of anatexis triggered by the Caledonian Movement in the Wuyishan tectonic belt.