With the increasing utilization of electrochemical impedance spectroscopy (EIS) in the field of corrosion research, the EIS analysis gradually become a great and important means for corrosion scientists. Especially in recent years, the corrosion processes involved in EIS studies become more and more complicated, not only for the diversity of corrosion environments and metallic materials, but also superficial- and/or interfacial-membranes on metal surface, thus such complex systems may bring too much difficulties for dealing with the relevant items, therewith the requirements for the normal and simple EIS analysis may not be satisfied any more. Comparing with electrochemical kinetics, the EIS analysis with the simulated equivalent circuit (SEQC) is fast propagating recently, because it is more simple, intuitive and accepted for the corrosion scientists, especially the ones of non-professional electrochemists. However, there exists inherent deficiency, shortages in preciseness and normalization for that technique, which may result in lower credibility of the relevant model of SEQCs. Therefore, the practical and reliable means in analysis of EIS should be created for the corrosion scientists with inadequate experience in electrochemistry, hence, the issues related with EIS analysis of corrosion processes were examined by the authors based on their experience in the field: i.e. the review of the present situation and the advantages and disadvantages of the application of the EQCS in EIS analysis of corrosion processes, and the discussion on the necessity and feasibility to enhance the credibility of SEQC in corrosion EIS analysis so that to establish tentatively routs for precise and normalized analysis of corrosion EIS by means of SEQCs.