In this paper, we tried to summarize the research development of steam mathane reforming (SMR) reactions in the aspects of reforming process and reaction mechanism, catlalysts material and properties evaluation, comparison of conventional and micro reactor reaction systems, and several coupling SMR power plant systems so on. The inductive results show that the SMR coupling with solid oxide fuel cell (SOFC), especially the studies about catalysts' material for unconventional micro-reactor and the micro-reactor structure incorporate with material need more deep research work.