Objective     To study the classification criteria for nasal defect due to rat bite wound and the selection of its clinical repair procedure.     Methods    Twenty-six patients with nasal defect due to rat bite wound admitted to our hospital in October 1998 to April 2010 were retrospectively analyzed. Nasal defect was classified according to its site and range. Its surgical outcome with nasal-label flap

auricular composite tissue graft，upper arm flap and outstretched frontal flap was studied.     Results    The nasal defect was divided into nasal tip defect，nasal ala defect，nasal tip and ala defect，and entire nose defect according to its site and range. The defect was repaired with a rather good outcome. The patients were followed up for 6 months to 3 years.     Conclusion     The effect of nasal defect due to rat bite wound is very great on the physiology and psychology of its patients. Scientific classification of nasal defect due to rat bite wound helps to select its optimal surgical procedure.