Background: Diabetic foot ulcer is a worldwide health care concern affecting tens of thousands of patients. If this ulcer is not treated well, it can create irretrievable difficulties. This study was designed to study the effect of infrared radiation on the healing of diabetic foot ulcer. Method: This was a clinical trial that was performed among hospitalized patients in Dr. Ganjavian hospital of Dezful . Sampling was purposeful and 50 patients, with stage 1 or 2 Diabetic foot ulcer, were selected. Then they were divided randomly in two groups. 25 patients were treated by routine dressing and 25 patients by Inferared radiation besides the routine dressing. All subjects matched using age, sex, Body Mass Index (BMI), stage of Diabetic foot ulcer, location of ulcer. Ulcers in two groups, was assessed by checklist in the zero, first, second, third and fourth weeks. Assessment parameters contain: degree of sore, color, periphery tissue of sore and amount of ulcers exudate. State of ulcers was determined and categorized to complete healing, partial healing, without improvement or worsening.