Objective To explore the utilization of emergency materials for mass disaster. Methods We retrospectively analyzed the 2 338 casualties from Wenchuan earthquake who visited our emergency department from 2:28 PM, May 12 to 2:28 PM, June 2. The injury condition and demand on emergency materials at different phase were also analyzed.Results mong the 2 338 casualties, the most common injuries were fracture, skin or soft tissue injury, and brain injury. Primary drugs are tetanus immune globulin, normal sodium and antibiotics. The injury condition and demand on medical resource were different at different phase. The demand on emergency materials depended on the category and severity of injury. Conclusion It is necessary to make a good medical resource planning for mass disaster. The catogory of injury and demand on emergency materials are different at different phase.