Aim of the study: to assess nurses' performance and postoperative outcome among patients undergoing gastrointestinal surgery. Subjects and Methods: Research design: A descriptive research design was carried out in this study Setting: The present study was conducted in gastrointestinal surgical unit, surgical operation and post anesthestic care units at Zagazig university hospitals. Subjects: A convenience sample of all available nurses (30) working in the mentioned setting and a purposive sample of ( 70) patients who fulfilling the inclusion criteria. Tool of data collection: Three tools were used for collecting data. Tool I: A self-administrated questionnaire about studied nurses. Tool II: An observational questionnaire for perioperative nursing care. Tool III: Interview assessment questionnaire for patients. Results: Majority of studied nurses (80%) had unsatisfactory total knowledge , nearly three quarter (73.3%) had unsatisfactory total practice regarding care of patient undergoing gastrointestinal surgery and more than half had moderate postoperative surgical outcome.