In microbiologically influenced corrosion (MIC) study, the electron acceptor of the cathode plays a decisive influence on corrosion characteristics. Some bacteria which can directly absorb electrons releasing from the anode reaction of the microbial dissolution of iron have been found in anaerobic biofilm studies, including some of the sulfate-reducing bacteria (SRB), methanogens and some other corrosion-reducing bacteria. These bacteria in biofilm are showing severe corrosion because of their different electron transfer mechanism. The corrosion mechanisms of these corrosion bacteria is called electron microbial influenced corrosion(EMIC), EMIC and its electronic transfer mechanisms distinct from those chemical microbial influenced corrosion(CMIC) mechanism bacteria that indirectly effects on the anode and cathode electrode reaction from nature. In recent years, EMIC mechanism has become a hot topic in the field of microbial corrosion. This paper describes the microbial membrane CMIC and EMIC and its electronic delivery mechanisms in detail, and gives some suggestions on corrosion studies