Abstract: To develop and apply the electronically controlled accumulator type fuel injection system, fuel pressure intensification process and fuel injection process were based on the accumulator type unit injector and the high speed solenoid valve; the common rail pressure was regulated by the electronic pressure regulator; the methods of electronic control for the fuel injection quantity and fuel injection pressure and fuel injection timing were determined; when the fuel injection system was matched with the diesel engine, the monitoring and tune up system was developed to meet the demand of matching. The fuel injection quantity, fuel injection pressure and fuel injection timing can be controlled flexibly, the maximum fuel injection pressure has reached 113 5 MPa; the fuel injection system was matched with the diesel engine 1150G tentatively, and the test result is satisfying. The electronically controlled accumulator type fuel injection system is more superior to the conventional fuel injection system in fuel injection pressure and flexible control of fuel injection pressure, fuel injection quantity and fuel injection timing