Methane-reforming in gas industry technology has been the focus of scientific research. It was found that there were many different ways making methane into synthesis gas ( CO and H₂) through scientific experiments, but their mechanism were not the same. With the continuous updating of research methods, the researches on the mechanism of reforming reaction were also gradually in depth. The development of mechanism and their status quo were described. Combined with carbon on catalyst surface, reaction conditions, yield and many other aspects, the various restructuring was compared, the existing mechanism was analyzed contrastively,which has a positive significance to the research of methane reforming experiment.