Background: The nurse is involved with the care of the trauma patient from arrival in the emergency department to follow-up in the trauma clinic. Chest injuries can be penetrating or the blunt type, depending on the nature and severity of the causative impact. The aim of this study was to assess nurses' performance regarding care of Chest Trauma patients at Trauma Emergency Unit. Design: Descriptive research designs were utilized in this study. Setting: This study was carried out in the emergency trauma unit at an assuit university hospital. A sample: of this study were all available nurses working in the emergency trauma unit at assuit university hospital (40). (Tools) two main tools used in this study Tool I: - ((Nurses Knowledge Questioner)) . Tool II: ((Nurses Practice observation checklist ) Results: the result revealed Level of nurses Knowledge regards total score that the majority of the nurses (70%) had an unsatisfactory Level total scores about chest trauma. The present study also revealed Nurses practice about chest trauma; that the majority of the nurses (95%) had an unsatisfactory. Level total scores about chest trauma. There was no a ststistical significant difference between nurses’ Knowledge and practice. The Conclusion the majority of the nurses was having an unsatisfactory level regarding nurses' knowledge and practice. There was no a ststistical significant difference between nurses’ Knowledge and practice. Recommendations: Regular continuous educational program plan about chest trauma Encouraging nurses to attend national and international congresses, seminars, symposia, and workshops regularly about chest trauma. Keywords: performance, Chest Trauma, for & Trauma Emergency Unit.