The rotator cuff is composed of supraspinatus, infraspinatus, subscapularis and teres minor . The supraspinatus is the most important part of rotator cuff and easily damaged.With the increase of age and the lifestyle, shoulder joint injury is often caused, It is also one of the main reason of adult shoulder joint pain. There are many treatments for this injury, but the best way has not been defined. This article reviews the characteristics, etiology, diagnosis and treatment of layered rotator cuff tear.