Arthroplasty is one of the most successful examples of renovation in the field of surgery, which has greatly improved the quality of survival of patients with end-stage arthritis. Minimally invasive surgery (MIS) has been developed over the past 20 years and has become increasingly sophisticated. After years of research, our team has accumulated a wealth of experience in minimally invasive knee replacement technology, which has five main features: small incision, less bleeding, less swelling and pain, shorter operation time, and faster recovery. First: small incision. The mini-midvastus approach (Mini-MV) is considered to be a minimally invasive approach with the best protection of the knee extensor function and the fastest postoperative recovery, and it is gradually being used widely in clinical practice. On the one hand, it meets the cosmetic requirements of patients, and on the other hand, it has less soft tissue trauma, does not damage the knee extensor device, does not ectropion the patella, destroys less blood flow, makes the knee joint more stable after surgery, and the joint function recovers better, and can go down to the ground on the same day after surgery, walk easily after a week, and the joint range of motion easily reaches 90 degrees, and start walking freely after 2 weeks, and can train to go up and down stairs. Second: less bleeding. Designed to apply strict bleeding control techniques, introduce the concept of bloodless surgery, and refine bleeding management from preoperative to postoperative, the measures basically include the following: 1. Preoperative assessment of bleeding-prone people (history of ulcers, long-term use of anticoagulants such as aspirin, long-term oral anti-inflammatory and analgesic drugs, long-term application of blood-stasis activating herbs, long-term alcohol consumption, smoking, etc.) Abnormal liver function, bone marrow hematopoietic dysfunction. (Patients with less platelets, coagulation factor deficiency such as hemophilia, etc.); 2. Further intraoperative assessment: if extensive active bleeding after cutting the skin is difficult to control with the electric knife, it belongs to the bleeding-prone group; those who have difficulty in controlling bleeding by sawing the bone bleeding belong to the bleeding-prone group; complete intraoperative hemostasis under direct vision (4 times to stop bleeding). Intraoperative and postoperative application of tranexamic acid is recommended, and intraoperative and postoperative application of autologous blood transfusion device to avoid blood waste. Anticoagulation is also firmly avoided to avoid hemorrhage. Local pressure bandages and ice packs are applied to reduce bleeding. Third: light swelling and pain. Optimize the surgical procedure to save and reduce the operation time, thus reducing the ischemic time of the lower limbs, reducing postoperative swelling, and promoting the blood circulation of the lower limbs by applying ice packs to the affected parts after the operation. The perioperative period was managed painlessly by preoperative over-the-top analgesia, along with a cocktail of analgesic therapy: ropivacaine 2, epinephrine 1/4, morphine 3mg-5mg, Depo-Provera 1, gentamicin 160,000 U. After suturing, the cavity was re-infused with tranexamic acid. Postoperatively, patients are basically pain-free and can exercise early, lift their legs, remove the urinary catheter early and get off the floor early, and walk painlessly on the next day, which reassures patients to get out of bed for functional exercise, alleviates their psychological pressure, reduces the postoperative pain index, and significantly reduces their dependence on painkillers. Fourth: The operation time is short. This reduces the ischemic time and postoperative swelling, as well as the invisible postoperative bleeding caused by prolonged tourniquet; the short exposure time of the operative field can reduce the risk of infection; and the risk of DVT after surgery is reduced. Fifth: fast recovery. Refined perioperative care, teaching patients functional exercise before surgery, actively guiding patients functional forging after surgery, etc., patients can get fast recovery, knee replacement mobility can reach 0-135 degrees and resume normal life.