The problems of industry monorail conveying system brought by tradition physical contact such as irregular contact spark, carbon laydown and unsafe, narrow the area which the material handling system can apply to in awful industry environment, e.g. forge, cleaning, lacquering. A novel monorail power supply method based on electromagnetic coupling theory is presented. Discussions are made on several problems such as frequency selection, load control, efficiency elements and harmonic effects at the same time. Moreover, solutions are brought about according to them. The monorail application of this technology provides clean, stable and safe power supply, and immunes to environment interference such as dust, water as well.