The Shabaosi gold deposit is only a large gold deposit in the northern Great Xing’an Range. Basing on quartz 40Ar/39Ar dating (crushing in vacuum and stepwise heating on crushed powders), we firstly obtained the ore forming age of the Shabaosi gold deposit. The crushing experiment yielded an isochron age of 130.1±1.3 Ma for primary fluid inclusions of quartz veins. The40Ar/39Ar dating by heating quartz power yielded an isochron age of 133.1±3.5 Ma for the microcrystal potash feldspars in quartz veins. The age of primary fluid inclusions in the quartz veins is coupled with that of the microcrystal potash feldspars and ~130 Ma may represent the forming age of Au bearing quartz veins. The Shabaosi deposit was formed in the Early Cretaceous in a tectonic transition setting of the post collisional regime of the Mongolia Okhotsk orogeny from compression to extension.