Postoperative clinical characteristics: 1. Posterior pectoralis major muscle gap: the operation is relatively easy and the operation time is short, but the postoperative pain is obvious and the recovery is slow. The position of the prosthesis is more fixed, lacking the sense of fluctuation, and the cleavage shape is not good. 2.Posterior mammary space: the operation time is slightly longer, the postoperative pain is light, the recovery is fast, the feel is more realistic, the breast has a sense of fluctuation and better cleavage shape during postoperative activities, and the perception is more realistic. However, the rate of postoperative contracture of the pericardium is higher. 3. The subfascial pectoralis muscle is located between the pectoralis major muscle and the pectoralis major tendon membrane, which has a good bed, and has the advantages of all the above-mentioned levels. By placing the prosthesis into this gap, there is no direct contact with the mammary gland, avoiding the tension when the upper arm is lifted; having a better sense of breast movement and cleavage effect. Sparing in anatomical level, no bleeding during surgery, and low rate of postoperative periosteal contracture. 4, dual plane method because of the pectoralis major muscle of the lower edge of the rib stop off, so the direction of force on the prosthesis is no longer biased upward to the trend is small, when the pectoral muscle movement, the impact on the prosthesis is reduced, effectively reducing the pectoral muscle deformation of the disadvantages of the traditional two methods combined together, so that the post-operative effect is more satisfactory. Dual-plane technology is a new technology born to overcome the shortcomings of conventional breast augmentation technology, and thus is suitable for all cases of breast augmentation surgery. It is a technique that has been used for a long time and can improve the relative lack of hand feeling and movement under the pectoralis major muscle to the greatest extent. It is one of the more popular planes of implant placement at present.