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Objective To retrospectively demonstrate risk factors for mortality in multiple trauma patients with acute respiratory distress syndrome(ARDS).Method This wes a retrospective cohort stuay regarding multi-ple trauma as a single cause for intensive care unit admission.Patients identified multiple trauma with ARDS en-rolled in prospectively maintained database between May 2003 and April 2008 were observed,and 23 items of po-tential risk factors of impacting mortality were calculated by univariate and multivariate logistic analyses in order to find distinctive items in these multiple trauma patients.Information on patients demographics characteristics,treat-ment procedures and injury severity were collected at the time of EICU admission.The criteria used for ARDS met definition of the guideline(2006)of Chinese medical association.The commonly accepted definition of multiple injuries was consistent with both several injury sites(generated from two or more than two anatomic sites)and in-jury in one anatomic site at least threatening life.Severity of injury was quantified by injury severity seore and the simplified acute physiology score and chronic health evaluation score (APACHE Ⅱ)in EICU admission.We in-cluded adult patients(age≥18 years),those with an EICU length of stay longer than 48 hours,and those accept-ing mechanical ventilation more than 24 hours.Patients who were readmitted to EICU by virtue of non-traffic injury or transferred to EICU from other hospitals after long-term treatment were excluded.Mortality was assessed at the 28th clay after trauma.Results There were 269 multiple trauma patients with posttranmatic ARDS admitted to ICU during the study period,the unadjusted odds ratio(OR)and 95% confidence intervals(CI)of mortality were associated with six risk factors(APACHE Ⅱ score,duration of tratuna factor,pulmonary contusion,aspiration of gastric contents,sepsis and duration of mechanical ventilation)out of 23 items.The adjusted Odds Ratios(ORs) with 95% CI were denoted with respect to surviving beyond 96 hours ICU admission(APACHE Ⅱ score,duration of trauma factor,aspiration of gastric contents),APACHE Ⅱ score beyond 20 ICU admission(duration of trauma factor,scpsis,duration of mechanical ventilation)and mechanical ventilation beyond 7 days ICU admission(dura-tion of trauma factor and sepsis).Conclusions Impact of pulmonary contusion and APACHE Ⅱ score contribut-ing to prediction of mortality may exist in prophase after multiple trauma.Sepsis is still a vital risk factor referring to systemic inflammatory response syndrome,infection,and secondary multiple organs dysthnetion.Aspiration of gastric contents could lead to incremental mortality due to scvere ventilation associated pneumonia.Duration of trauma factor determined degree of injury and outcomes,longer duration generally manifested higher mortality.Long-standing mechanical ventilation should be constrained on account of occurring severe refractory complications.