A gas turbine including a compressor , a combustor and first stage to fourth stage turbine blades (11-14) and four stage turbine vanes, and a turbine blade cooling system, in which the compressor includes a plurality of rotation members , and the compressor is divided into a front-stage compressor , a middle-stage compressor and a rear-stage compressor in sequence from a farthest position from the combustor, wherein after driving the first stage to the fourth stage turbine blades, a combustion air is discharged to an outside of the gas turbine; the gas turbine comprising: outside paths for inducing fluid from the compressor through the outside of a gas turbine casing; a center shaft path for supplying fluid from the compressor by penetrating the inside of a center shaft of the gas turbine ; and inside paths for supplying fluid from the compressor through a connection to the outlet of the compressor , wherein the fluid induced through the outside paths , the center shaft path or the inside paths cools at least part of the turbine blades (11-14); and wherein the front-stage compressor , the middle-stage compressor and the rear-stage compressor are respectively provided with inlets of the outside paths , wherein the outside path connected to the front-stage compressor has outlets provided to at least one turbine vane and a combustion air discharge hole cover; wherein the outside path connected to the rear-stage compressor is provided to at least one turbine vane; and wherein the inside paths directly supply fluid from the compressor to at least one turbine vane and at least one turbine blade; and wherein - the outside path connected to the middle-stage compressor has an outlet provided to at least one turbine vane, and the middle-stage compressor is additionally provided with an inlet of the center shaft path , and an outlet of the center shaft path is provided to at least one turbine blade. outside paths for inducing fluid from the compressor through the outside of a gas turbine casing; a center shaft path for supplying fluid from the compressor by penetrating the inside of a center shaft of the gas turbine ; and inside paths for supplying fluid from the compressor through a connection to the outlet of the compressor , wherein the fluid induced through the outside paths , the center shaft path or the inside paths cools at least part of the turbine blades (11-14); and wherein the front-stage compressor , the middle-stage compressor and the rear-stage compressor are respectively provided with inlets of the outside paths , wherein the outside path connected to the front-stage compressor has outlets provided to at least one turbine vane and a combustion air discharge hole cover; wherein the outside path connected to the rear-stage compressor is provided to at least one turbine vane; and wherein the inside paths directly supply fluid from the compressor to at least one turbine vane and at least one turbine blade; and wherein - the outside path connected to the middle-stage compressor has an outlet provided to at least one turbine vane, and the middle-stage compressor is additionally provided with an inlet of the center shaft path , and an outlet of the center shaft path is provided to at least one turbine blade. - the outside path connected to the middle-stage compressor has an outlet provided to at least one turbine vane, and the middle-stage compressor is additionally provided with an inlet of the center shaft path , and an outlet of the center shaft path is provided to at least one turbine blade. <EOS>