PROBLEM TO BE SOLVED: To provide such a fuel injection system that it can utilize RQL concept in a gas turbine combustor having a liner equipped with one or more trap eddy cavities. SOLUTION: This device includes a plurality of fuel injection bars 50 which are arranged in circumferential direction around a dome inlet module 20 where a plurality of passages are made inside and beside are in conformity with it, and the fuel injection bars circulate with a fuel supply source, and each fuel injection bar further possesses the main body part having an upstream end and a downstream end and a pair of flanks. At least one injector is made at the downstream end of the main body of the injection bar, and it communicates with a fuel supply source, whereby fuel is supplied to cavities 40 and 42 through the fuel injection bar, according to a rich-quenching-lean(RQL) system. In quick response to the RQL system, fresh air is supplied directly into a combustion room 12, passing through the passage of the dome inlet module, which maximizes the distance capable of being utilized to put it in lean condition by favorable mixture of combustion gas and quick dilution.