Keratoconus is a common non-inflammatory,chronic,progressive,corneal local expansionary disease,with features as follows:the central or beside central corneal stroma thinning,conical prominent deformation in central vertex,corneal loses its normal arc,produces irregular astigmatism and scar,thus leading to the cornea optical performance severely reduction,.The etiology of conical cornea is not yet clear,with certain genetic predisposition,also relevant with collagen developmental disorders,endocrine and metabolic disorder,immune cell defects and so on,also may be multifactor pathogenesis.With generalization of corneal refractive surgical treatment,early diagnosis of keratoconus is of far-reaching significance.Mastering clinical characteristics and common diagnostic criteria,especially early diagnosis,accurate preoperative screening of keratoconus,are very important for implementing corneal refractive surgery,effective prevention and cure of surgical complications.In this paper,clinical features of keratoconus and current treatment methods are briefly discussed.