EFI system in the Common Rail Diesel Engine, high-speed operation of the diesel injection process only 0.07 seconds time in the course of high-pressure injection tubing pressure throughout with time and location of the different change. As diesel compressibility and high pressure tubing pressure fluctuations in diesel, the actual fuel pump and injector status under the law of supply plunger greater difference. Tubing, sometimes the pressure fluctuations in the main jet, so that the pressure within the high-pressure pipeline rose again, reaching the injector pressure to open the valve, the valve has been closed and reopened the secondary injection phenomenon, Because it is impossible to burn the second injection, so an increase of smoke and hydrocarbons (HC) emissions, fuel consumption increases. In addition, each spray cycle of the high-pressure pipeline residual pressure will change the ensuing instability arising from the jet, especially in the low-speed region prone to this phenomenon, not only serious injection uneven, but will not spray in intermittent phenomenon. To address this diesel engine fuel pressure changes shortcomings, the modern use of a diesel engine known as the "Common Rail" technology.