Abstract: Objective To clarify the factors associate with the length of stay (LOS) in Lushan Earthquake victims. Methods We retrospectively analyzed the medical information of 263 traumatic patients admitted to West China Hospital, Sichuan University after the Lushan Earthquake. Ten variables extracted for the analysis, including gender, age, injuried time, multiple injury, infection, comorbidities, Injury Severity Score (ISS), Revised Trauma Score (RTS ) CRAMS score, and Prehospital Index (PHI ). Univariable analysis using multiple stepwise regression analysis was performed to identify the factors associated with extended LOS. Results Infection, ISS score, and Pre-hospital Time were associated with extended LOS，and infection was the most weighted factor. The regression equation is：LOS (h)=498.36+671.41×Infection +43.87×ISS score -5.12×Pre-hospital Time. Conclusion This study demonstrated that trauma patients with infections and high ISS scores were at increased risk for extended LOS and pre-hospital time decreased the risk.