The invention discloses an electronic control system of a single ECU sub-control throttle valve, and provides an electronic control fuel injection system structure for feeding fuel for a gasoline engine. The electronic control fuel injection system structure for feeding the fuel for the gasoline engine comprises a throttle valve body 3, a fuel injector 5, a steering engine and connecting piece 2 and an angle sensor 4. The throttle valve body is installed on an engine air inlet valve 1, the fuel injector, the steering engine and the angle sensor are installed on the throttle valve body, air enters from an air inlet, the fuel is atomized and injected into the throttle valve body through the fuel injector and mixed in the throttle valve body to enter an engine air inlet channel; the steeringengine controls the starting angle of a valve shaft piece, the amount of air inlet can be controlled, the angle sensor is connected to a valve shaft end, and the starting angle of the valve shaft piece can be detected, and the starting angle of the valve shaft piece is fed back to an ECU; and the ECU adjusts the working state of each throttle valve according to the flight condition of an unmannedaerial vehicle. The electric control fuel injection system has the advantages that the structure is compact, installation and debugging are convenient, the reliability is high, the weight is low, combustion is good, atomization mixing in advance achieves the optimal combustion medium ratio and the like, and the flight control function extension of the unmanned aerial vehicle is relatively convenient.