A method of unloading a gas turbine module in a gas turbine plant, in which the gas turbine module is a no. 1 gas turbine module and includes a gas turbine that has a gas turbine rotor capable of rotating about an axis (Ar), and a turbine shell which covers the gas turbine rotor and in which an inlet and an exhaust are formed; an inlet plenum that is connected to the inlet of the gas turbine and is configured to guide air from an inlet duct into the gas turbine; an exhaust plenum that is connected to the exhaust of the gas turbine and is configured to guide exhaust gas (Gex) from the gas turbine to an exhaust duct; an enclosure that covers the gas turbine; a gas turbine base on which the gas turbine and the inlet plenum are mounted; and a common base on which the gas turbine base, the exhaust plenum, and the enclosure are mounted and which is connected to a gas turbine foundation, wherein the method includes executing the steps comprising: a connection release step of releasing a connection between the common base and the gas turbine foundation, and releasing connections between the no. 1 gas turbine module and a plurality of connection objects that are connected to the No. 1 gas turbine module and constitute a part of a gas turbine plant; a module raising step of lifting the no. 1 gas turbine module from the gas turbine foundation after the connection release step; a moving equipment disposition step of disposing moving equipment that is configured to move the no. 1 gas turbine module in a gap between the common base and the gas turbine foundation during the module raising step; a module lowering step of ending the module raising step after the moving equipment disposition step and placing the no. 1 gas turbine module on the moving equipment; and an unloading step of driving the moving equipment after the module lowering step and moving the no. 1 gas turbine module. a gas turbine that has a gas turbine rotor capable of rotating about an axis (Ar), and a turbine shell which covers the gas turbine rotor and in which an inlet and an exhaust are formed; an inlet plenum that is connected to the inlet of the gas turbine and is configured to guide air from an inlet duct into the gas turbine; an exhaust plenum that is connected to the exhaust of the gas turbine and is configured to guide exhaust gas (Gex) from the gas turbine to an exhaust duct; an enclosure that covers the gas turbine; a gas turbine base on which the gas turbine and the inlet plenum are mounted; and a common base on which the gas turbine base, the exhaust plenum, and the enclosure are mounted and which is connected to a gas turbine foundation, a gas turbine base on which the gas turbine and the inlet plenum are mounted; and a common base on which the gas turbine base, the exhaust plenum, and the enclosure are mounted and which is connected to a gas turbine foundation, wherein the method includes executing the steps comprising: a connection release step of releasing a connection between the common base and the gas turbine foundation, and releasing connections between the no. 1 gas turbine module and a plurality of connection objects that are connected to the No. 1 gas turbine module and constitute a part of a gas turbine plant; a module raising step of lifting the no. 1 gas turbine module from the gas turbine foundation after the connection release step; a moving equipment disposition step of disposing moving equipment that is configured to move the no. 1 gas turbine module in a gap between the common base and the gas turbine foundation during the module raising step; a module lowering step of ending the module raising step after the moving equipment disposition step and placing the no. 1 gas turbine module on the moving equipment; and an unloading step of driving the moving equipment after the module lowering step and moving the no. 1 gas turbine module. a connection release step of releasing a connection between the common base and the gas turbine foundation, and releasing connections between the no. 1 gas turbine module and a plurality of connection objects that are connected to the No. 1 gas turbine module and constitute a part of a gas turbine plant; a module raising step of lifting the no. 1 gas turbine module from the gas turbine foundation after the connection release step; a moving equipment disposition step of disposing moving equipment that is configured to move the no. 1 gas turbine module in a gap between the common base and the gas turbine foundation during the module raising step; a module lowering step of ending the module raising step after the moving equipment disposition step and placing the no. 1 gas turbine module on the moving equipment; and an unloading step of driving the moving equipment after the module lowering step and moving the no. 1 gas turbine module.