Objective According to characteristics of the wounded, we discussed the key points of Triage Algorithm during the large scale disasters occurring. It will provide some suggestion for establ ishment the triage process, matching with reasonable medical resources on time and making medical care promotion. Method Analysis the data of patients sent to emergency department of West China Hospital in different periods after temblor, and make conclusion on alternation of the triage process. Result A total of 2621 wounded people have been treated in West China Hospital three weeks after earthquake. The severity of patients in a seimic disaster sent to hospital changed as time went on. The percentage of skin and soft tissue injuries and l imbs fractures is 45%. The percentage of crush injury is 4.3%. There are five cases of gas gangrene and none of hospital cross-infection. Conclusion Triage the victims after earthquake dynamically increases the survival rate and decreases the mortal ity and overtriage rate, the key process of triage systems should be modified dynamically with characters alternation of the victims after China Wenchuan earthquake, the rescue level and effect can be made progress.