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This paper describes an analysis method of most suitable rasp for the patients by using the ultrasonic system. In it, we employ the single ultrasonic probe. At first, we make a knock to the upper point of the rasp inserted with a hammer which has the trigger signals. By using the knocking signals, we measured the acoustic signals. An ultrasonic probe for measuring is fixed in the upper side of the rasp with a built-in magnet. The acoustic data is changed to the digital data by the AD converter and is sent to the personal computer. In the clinical treatment, one of the indexes to judge how degree the rasp is fixed for the patient is the knocked sound by a hammer when inserting the rasp. In the surgery, the surgeon tries to adapt for the patient from the small size rasp to the larger size rasp in turn. Therefore, we suggest our measurement system which selects the best fixed rasp by using acoustic signal for surgeons and patients of total hip arthroplasty.