Method for balancing and assembling a turbine rotor including at least one turbine disk with a turbine flange and a front cover disk with a flange, as well as a compressor rotor with a compressor flange of a gas turbine, - where in a first step, the flange of the front cover disk is fastened by means of bolted connections to the turbine flange of the turbine disk, and the turbine disk is balanced together with the cover disk by attaching balancing weights at suitable circumferential positions of the bolted connections, - where in a second step, the flanges (5, 7) of the turbine disk and the cover disk are braced by means of a clamping device (19, 20), - where in a third step the bolted connections used in the first step are removed, where the balancing weights used for balancing of the turbine disk and cover disk at the circumferential positions of the balancing weights on the turbine rotor are removed before the compressor rotor is fitted, - where in a fourth step the flange of the turbine disk and the flange of the cover disk are connected to the flange of the compressor rotor by means of bolted connections, where the compressor rotor is balanced before connection to the turbine disk and the cover disk using balancing weights, - and where the balancing weights at the circumferential positions of the balancing weights on the compressor rotor used for balancing of the compressor rotor are removed before the compressor rotor is fitted, - where in a fifth step the clamping device (19, 20) is removed, and - where, based on the removed balancing weights at the circumferential positions of the balancing weights on the compressor rotor and the turbine disk connected to the cover disk, resultant balancing weights at the circumferential positions of the balancing weights on the turbine rotor are determined and fitted at resultant circumferential positions of the bolted connections. - where in a first step, the flange of the front cover disk is fastened by means of bolted connections to the turbine flange of the turbine disk, and the turbine disk is balanced together with the cover disk by attaching balancing weights at suitable circumferential positions of the bolted connections, - where in a second step, the flanges (5, 7) of the turbine disk and the cover disk are braced by means of a clamping device (19, 20), - where in a third step the bolted connections used in the first step are removed, where the balancing weights used for balancing of the turbine disk and cover disk at the circumferential positions of the balancing weights on the turbine rotor are removed before the compressor rotor is fitted, - where in a fourth step the flange of the turbine disk and the flange of the cover disk are connected to the flange of the compressor rotor by means of bolted connections, where the compressor rotor is balanced before connection to the turbine disk and the cover disk using balancing weights, - and where the balancing weights at the circumferential positions of the balancing weights on the compressor rotor used for balancing of the compressor rotor are removed before the compressor rotor is fitted, - where in a fifth step the clamping device (19, 20) is removed, and - where, based on the removed balancing weights at the circumferential positions of the balancing weights on the compressor rotor and the turbine disk connected to the cover disk, resultant balancing weights at the circumferential positions of the balancing weights on the turbine rotor are determined and fitted at resultant circumferential positions of the bolted connections.