Because boron isotope has good stability, it can be used for tracing source character. The LAMCICPMS tourmaline insitu B isotope analyses on the tourmalinebearing sericitequartz alteration zone exhibit that these tourmalines have δ11B (-211‰~11‰), these data have two peak value, one enrich with heavy B isotope (-15‰~15‰) and other enrich with light B isotope (-16‰~-14‰). Combined with regional geological data and other previous boron isotope data, B isotope of Tongkuangyu coppermolybdenum deposit shows the characteristic of continental hydrothermal system. Based on geological analysis and boron isotope database, we infer that peak value of light B isotope maybe come from wall rock of volcanic rocks, however, slightly heavy B isotope maybe have character of island arc volcanic rocks, and heavy B isotope maybe come from granodioriteporphyry and granodiorite of Tongkuangyu coppermolybdenum deposit. Comparing to other type porphyry copper deposits and IOCG deposits, Tongkuangyu coppermolybdenum deposit has the characteristics of enrichment light B isotope, which means that many continental B isotope add to mineralization of Tongkuangyu coppermolybdenum deposit.