CuInl-xMnxTe2 samples have been synthesized by a melt-annealing method.The x-ray powder diffraction (XRD) analysis shows that the CuIn1-xMnxTe2 samples crystallize in the chalcopyrite phase.Mn doping can effectively optimize the electrical properties and accordingly improve the power factor.The room temperature electrical conductivity of doped CuInTe2 increases by several orders of magnitude due to substituting In with Mn.In addition,a large reduction in thermal conductivity is achieved through the enhanced phonon scattering via Mn-related point defects and precipitates.Therefore,an enhanced average ZT value up to 0.34 is achieved for sample CuIno.925 Mno.075Te2,which is 41％ higher than that of the pristine CuInTe2.