This paper introduces the silver-steel near-surface of the ultrasonic flaw detection method to solve Baosteel Company Limited Special Steel Brach production of SUJ2 silver-steel bar detection problem as an example, focuses on silver-steel bar near-surface defects of ultrasonic shear wave testing method and technical feasibility. On the silver-steel bar ultrasonic shear wave of the angle detection technology, detection range, the water distance, and other technical parameters of the mathematical expression. Analysis of ultrasonic shear wave technology in the detection angle, detection range, the water distance, and other technical parameters SUJ2 silver-steel bar near-surface defect detection in the process of selection principle. Through silver-steel bar near-surface defect detection testing, validation ultrasonic shear wave technology on the bar near -surface defect detection testing is an effective method to solve SUJ2 silver-steel Bar near-surface defect detection problems. The company meets NSK Japan for SUJ2 silver-steel bar quality requirements.