Objectives: The magmatic activity of the Gangdese granite belt has a very complicated history. This research studies the petrology, petrogeochemistry and zircon U- Pb isotopic chronology of the composite granites in Charong—Ding’ou, in order to provide constraints for the Jurassic tectonic magmatic evolution process in this area. Methods: On the basis of detailed field geological survey, the petrology, petrogeochemistry and zircon U- Pb dating , geochemistry and tectonic environment of the composite granites in Charong—Ding’ou were systematically studied. Results: The type of rock mass of the composite granites in Charong—Ding’ou is quartz diorite, bioadamellite and monzonitic granite, and there is a abrupt contact relationship between the intrusions. The U- Pb isotope age of diorite was 155.4±2.7Ma. The U- Pb isotopic age of the bioadamellite was 152.0±1.3Ma, all of which were late Jurassic. The rock geochemistry shows that all three are high- k and calc- alkaline series of rocks, the quartz diorite is weakly aluminum — quasi- aluminum，The bio- adamellite and monzonitic granite are aluminum — peraluminous. The bio- adamellite and monzonitic granite characterized by silicon—alkali enrichment and poor Ca, Mg, and Ti. The light rare earth elements more enrichment, light rare earth fractionating degree is higher，compared to quartz diorite。The differentiation characteristics of trace elements：the Ba, Sr, P Ti loss of monzonitic granite is obvious and The Rb, Th, K accumulation of bioadamellite is most obvious.The Rb/Sr (0.18~0.46) and Rb/Ba (0.13~0.26) of quartz diorite indicate their evolution differentiation degree is low，compared to bioadamellite and monzonitic granite.  Conclusions: Charong—Ding’ou composite granites should be the same age with different stages complex rock mass, and early state is Type I quartz diorite and bioadamellite with Type S monzonitic granite in late state. The compound rock mass is not from a single subduction environment and monzonitic granite may be from arc continental collision.