The present invention relates to a gas turbine including a free swirl system for preventing flow disturbance in a gas turbine in which an air inlet duct for introducing air to a pre-swirl system includes a plurality of partial ducts. And a compressor disposed in the casing, the compressor for sucking air and compressing the air at high pressure, a combustor for mixing the compressed air by the compressor with fuel, and a high-temperature, high-pressure combustion gas discharged from the combustor. A turbine for generating power by rotating a plurality of turbine blades, a free swirl system for swirling cooling air flowing into a lower end of the turbine blade, and a supply of cooling air discharged from the compressor to the free swirl system. An air inlet duct, the air inlet ducts having a plurality of The gas turbine is formed of a partial duct, characterized in that the position or area of the air flow in which the cooling air flows in the free swirl system corresponding to the position or area where the cooling air flows through the air inlet duct is provided. do.
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