Abstract: Chemical corrosion of cement-based materials, caused by its contacting with soft water for long-term, can induce cement decalcification, which may cause micro structure and macro performance deterioration, becoming one of the most common cement-based material degradation problems. In this paper, the researches on dissolution of cement-based materials at home and abroad are reviewed, the characteristics and the degradation progress of corrosion are discussed, and some corrosion models are introduced. Particularly, the effect of small pores on corrosion process, corrosion -resistant critical content of fly ash, the starting point of C-S-H decalcification and other controversial issues in present corrosion researches are pointed out, and personal opinion for related problems is put forward. In addition, the further research issues such as corrosion degradation mechanism, basic research theory, the quantitative relationship between parameters and the critical content of admixture are summarized, which can provide scientific research direction for the scholars.