Abstract: The Zhujianshui granite of Qitianling pluton is one of the granites whose emplacement age was determined isotopically by biotite K-Ar method during the early 1960＇s. Since then the Qitianling granitic pluton was considered to be Indosinian （Triassic） for many years. This paper studies the zircon SHRIMP U-Pb geochronology, petrology and geochemistry of the Zhujianshui granite, Qitianling pluton. An emplacement age of 160 ± 2 Ma was obtained which indicates an early Yanshanian （Jurassic） magmatic activity. The Zhujianshui granite is enriched in alkalies （ especially in K）, LILE＇s and HFSE＇s, and has a mantle-crustal mixed source. It was formed under a postorogenic extensional environment within the South China continent.