Objective To study the relationship between diabetic foot(DF)and the change of blood fluidity.Methods The blood viscosity、plasma viscosity、hematocrit、erythrocyte sedimentation rate、fibrinogen were determined in 126 type 2 diabetes cases.They were divided into DF group and non-diabetic foot(NDF)group.Results ①The incidence of DF is higher in older and longer course of diabetes cases with renalpathy、neuropathy、peripheral artery disease and retinopathy.② The blood viscosity、plasma viscosity、hematocrit、erythrocyte sedimentation rate and fibrinogen are significantly higher in DF group.③ The indexes of blood fluidity are significantly higher in Ankle Brachial Index(ABI)abnormal group than normal group.Conclusions To have the blood fluidity under control effectively is very important for prevention and treatment of DF.