We report herein a practical approach for regio-selective B-H/C-H bond activation at azo-substituted carboranes.The reaction proceeded through Iridium(Ⅲ)-induced selective B-H/C-H bond activations based on an azo directing group.Through this strategy,a series of mononuclear,trinuclear and tetranuclear cyclometalated iridium complexes containing Cp*Ir-B or Cp*Ir-C bonds were successfully isolated in a high yield.In this work,efficient routes are developed through one-pot reactions to prepare polynuclear organometallic complexes.