38 patients admitted to ICU and 15 healthy volunteers were successively enrolled in this study.The healthy volunteers were treated with endoscopy and biopsy .The 38 patients were treated with bedside gastroscopy and diagnosed with SRMD due to illness. The acute physiology and chronic health evaluation（APACHE）II score were evaluated, malondialdehyde (MDA) as an index of oxygen radical-lipid peroxidation was assessed in the serum. Transforming growth factor(TGF)β1,claudin3, interleukin (IL) 1 and interleukin（IL）10 levels in the gastric mucosa and plasma level of superoxide dismutase(SOD)，Ischemic modified albumin(IMA)and C-reactive protein（CRP）were evaluated.