Background: The bowel preparation remains a significant barrier for patients who need to undergo colonoscopy. Inadequate bowel preparations still occur in about 10–25% of colonoscopies. So the inadequate nursing intervention leads to inadequate bowel preparation, serious complications and dissatisfaction for the patient undergoing colonoscopy. Aim: to examine the effect of video assisted education on bowel clearance and satifaction among patients undergoing colonoscopy. Design: a quasi-experimental research design was utilized. Setting: Gastrointestinal Endoscopy Unit of Menoufia University Hospital. Sample: Consecutive sample of 60 patients undergoing colonoscopy were assigned randomly into two equal groups, 30 patients for each group: Study group (I): received video assisted education along with routine hospital care. Control group (II): received routine hospital care only. Instruments (1): Structured interviewing questionnaire (2): Boston Bowel Preparation Scale (BBPS) (3): Modified Group Health Association of America 9(mGHAA-9 Questionnaire). Results: The findings revealed that there were highly significant differences were existed between study and control groups regarding their degree of bowel clearance (P< 0.001) in addition to improvement of patients' satisfaction among the study group subjects than control group subjects. Conclusions: Video assisted education had a positive effect on enhancing quality of bowel clearance and improvements in patients' satisfaction for patients undergoing colonoscopy. Recommendations: Developing illustrative educational videos to encourage the patients for bowel preparation and improve patient satisfaction and training program for nurses to improve their skills in teaching patients about colonoscopy preparation and the importance for seeking rapid medical advice.