Obese patients have alterations in respiratory physiology and circulatory physiology that significantly affect their evaluation and resuscitation. Aim: To evaluate effect of nursing guidelines on obese trauma patients' outcomes. Research design: A quasi experimental research design was utilized. Setting: This study was conducted in trauma emergency unite of Dayrut General Hospital. Tool of data collection: (I): obese trauma patient assessmentand (II):  Patient evaluation sheet. Result: There were statistically significant difference between study and control groups regarding patient assessment and distribution of complication as hypoxia and apnea. Conclusion: study group showed reduced in complication and achieved satisfactory level according achieved points regarding patient out come after application of nursing guidelines. Recommendation: study need to conduct in a large number of patient and involved inpatient and ICU obese trauma patients.