Diabetic foot with high mutilation rate and mortality results in high cost of treatment. The classification of diabetic foot has important value to the treatment options and prognosis assessment. Some diabetic foot classification systems are discussed in this paper, such as Meggitt/Wagner, Texas, S (AD) SAD,DEPA, PEDIS, Strauss, DUSS. Each classification has advantages and disadvantages by itself. These classifications comprise the following parameters : peripheral vascular disease ( PVD), infection, the depth, area and position of an ulcer, peripheral neuropathy( PN), and so on. None has gained widespread acceptance about the parameters and the way of classification of diabetic foot.