A 42 years old male with the traumatic flase aneurysm that occurred in right femoral artery after injury of knife was reported at the department of Orthopedic surgery of Hanyang University Hospital. In this case, a false aneurysmal sac was located at the anterolateral aspect of right femoral artery just below the sartorius muscle, and repaired by resection of sac and interrupted suture of arterial wall with 6~0 silk. The postoperative result was good, and there has been no evidence of recurrence.