Abstract：The Cailing granite on the eastern margin of the Qitianling granite was precisely dated at 160±2 Ma using zircon SHRIMP, which suggests that the Cailing granite was intruded in the early Yanshanian, rather than in the Indosinian as is considered previously. A few inherited cores record Mesoproterozoic age information, which indicates that Precambrian rocks might be one of the important components in the granitic magma melting source region in the study area.