The natural gas common rail Fuel pipe which is an important component of marine high pressure direct injection natural gas engine is need to optimize. A 1-D dimensional working process model including natural gas common rail pipe and high-pressure natural gas pipe was established in this paper and different common rail pipe schemes was compared and analyzed. The results show that transient pressure fluctuation before the first cylinder injector in the four schemes of short natural gas common rail pipe is little difference, and the cyclic variation coefficient decreases with the increase of the volume. Finally, the short common rail pipe scheme 1 is choose as the best design scheme.