To study the performance of chemically recuperated gas turbine(CRGT) system,based on the thermodynamic analysis,the mathematical model of a three-axis CRGT system was established with the use of MATLAB/Simulink software.Simulation results show that the steam reforming reaction in the fuel occurs and increases the calorific value,which can increase the relative efficiency of devices by more than 32%.Under the constant output power,the inlet temperature of the turbine drops obviously,which can prolong the service life of the gas turbine system and cut down the exhaust temperature substantially.With the same geometrical structure of the turbine,the engine operating line can work far away from the stall margin,which is beneficial to the improvement of compressor surge margin.