This study is a prospective randomized controlled study of rotator cuff repair with lateral raw or double raw combined with microfracture procedure. The patients with rotator cuff tear were randomly divided into groups before the operation. The patients were followed up before and, 3 months, 6 months, 12 months and 24 months after surgery. In different time periods, the quantitative and qualitative indicators including pain, functional score, muscle strength, MRI performance, etc. were compared between groups at the same time period to evaluate the difference in the effect of double raw or only lateral raw repair combined with microfracture on the treatment of rotator cuff. In order to figure out whether medial raw anchor necessary during tendon repair combined with microfracture in small to medium size rotator cuff tear.