The Bi 3+ substituted composite rare earth iron garnet (TbYbBi) 3Fe 5O 12 (TbYbBiIG) bulk single crystals have been successfully grown by using Bi 2O 3/B 2O 3 as a flux. The wavelength and temperature dependence of Faraday rotation of TbYbBiIG have been measured together with the optical absorption spectra in the wavelength range of 1.0～1.7 μm. The Faraday rotation temperature coefficient of a new type TbYbBiIG bulk crystal is -2.3×10 -2 (deg/mm·K) in temperature range of 10 ℃ to 80 ℃ and it is expected to be used as a more practical Faraday rotator for optical isolator with temperature-stable isolation.