The gas turbine unit is used to conduct new cycle tests for gas turbines using air as the working medium. It can be applied in various complex thermodynamic cycles, including: regenerative cycle, water injection regenerative cycle, steam injection regenerative cycle, and wet air turbine cycle, and various test studies can be carried out, such as: start-stop characteristic test, dynamic characteristic test, characteristic test affected by environmental temperature, part-load characteristic test, control strategy test, and thermal-electric ratio regulation characteristic test, etc. Under ISO conditions, the rated power of the simple cycle of the gas turbine is ≥ 8 MW.