The Diastasis Recti Abdominis (DRA) is one of postpartum complications and abdominis muscles training is often used for the rehabilitation of DRA, but there are no universally acceptable training modes and the support of corresponding theories. In this paper, the researching methods, mechanism and the effects of rehabilitation of DRA were reviewed from abdominal wall biomechanics. The reasons for the controversy are also analyzed in the meantime: The measurement methods and measurement sites of the rectus abdominis muscle thickness are inconsistent; the mechanism of DRA was not searched by biomechanical methods. Therefore, in the future, we should standardize the prediction of the effect of training of DRA, so as to provide a basis for abdominal muscle training.