In this final paper a project for upgrading of the gas turbine with thermal regeneration has been developed. It is an industrial gas turbine that uses natural gas. With the help of input data, the lower heating power of natural gas 50 MJ/kg, input pressure in the turbocharger 1 bar, input temperature in the turbocharger 20 ℃, turbine inlet pressure 11,68 bar, turbine inlet temperature 990 ℃, outlet temperature in the turbocharger 335℃ and output temperature from the trubine 500 ℃, a calculation of gas turbine has been made. The calculation for gas turbine plant in several variants are presented. In the first part of the calculation, the operating parameters of the gas turbine running on real process are calculated, then in the second part also the operating parameters of the gas turbine have been calculated, but this time according to the ideal process. Finally in the third part the calculation of the real process of the gas turbine have been shown, but this time with heat regenerator. After the calculation the results are graphically displayed and analyzed. First, a comparison of the real and ideal process without a regenerator was performed, and then the effect of regenerator efficiency on the actual parameters of the actual gas turbine process was shown.