A great volume of magmatic rock bodies occurring as dykes or apophyses are developed in the Shizishan orefield of Tongling, Anhui province, and it is believed that they are closely related to the Cu, Au and polymetallic mineralization. The rocks around this ore field are mainly granodiorite, quartz monzodiorite and pyroxene monzodiorite. The highly precise SHRIMP UPb dating of zircons from these rocks shows that the ages of the magma emplacement are between 133.3Ma and 142.9Ma in late Jurassic and early Cretaceous period (equivalent to the late stage of Early Yanshanian) The magmatic bodies in the ore field were formed by multiple emplacements of contemporaneous magmas; the time of magma emplacement can be divided into two stages: one started at about 140Ma and the other about 136Ma. The interval time from the beginning of ascending and emplacement of magma until its cooling/crystallization is short. However, the Baimangshan pyroxene monzodiorite has longer cooling history and experienced more complicated processes such as earlystage fractionation crystallization in deep magma chamber, structural plusation, ascending and emplacement of magma, decompression and heating, melting of early crystals and cooling crystallization. Geochemical analysis suggested that, during the late stage of magma in the ore field, parent magma originating from the upper mantle or lower crust assimilated crustral material and assembled at the magma chamber, and then the new magma in the chamber fractionated and crystallized to some extent but did not solidified. Therefore, the composition of magma shows a feature of strip distribution. The magma in the chamber triggered stochastically by regional structural stress or tectonic events went up along structural fractures, and emplaced and then cooled crystallized.