Abstract: Objective:To observe the role of nursing intervention in preventing difficult urination or acute urinary retention after the urinary catheter was removed.Methods:Sixty patients detaining an indwelling urinary catheter after the orthopedic operation were randomly divided into test group (30 cases) and control group (30 cases).The test group were applied urethral external aperture fomentation after the urinary catheter was removed,while the control group adopted lower abdominal fomentation.The two groups were released of the urinary catheter one day after the operation and removed of the catheters when the patients had a filled bladder and micturition desire.Results:The first uresis time of the test group was (28.6±4.4) minutes after the urinary catheters were removed,and the successful rate of urination was 93.3%;While it was (68.3±4.6) minutes in the control group,and the successful rate of urination was 63.3%.The difference was significant (P<0.01).Conclusions:Timing opening of the urinary catheter and urethral external aperture fomentation after the urinary catheter is removed may effectively relieve the difficulty of the patients in urination and avoid reinsertion of the urethral catheterization.