To promote energy saving and consumption reducing environmental pollution,and improve economic benefit,we have widely used the technology of power supply by electricity instead of fuel for the RTG in harbors which has three major ways,i. e.sliding touch line with low support,cable reel and sliding touch line with high support.Based on the reform of electricity changed from fuel for the RTG by sliding touch line with low support,the paper discusses the power supply and distribution layout of “changing of power supply from fuel to electricity” for the RTG,power supply mode by sliding touch line with low support and reform of power supply for the gantry crane.