Recovery after minimally invasive knee surgery is usually possible in 1-3 months, which is divided into the following cases: First, conventional diseases such as knee synovitis, knee free bodies and cartilage injuries, swelling can be eliminated in about two weeks after surgery through arthroscopy, and function is restored four weeks after surgery. Second, arthroscopic surgical sutures for knee meniscus injury, depending on the surgical suture site, joint swelling is eliminated 2-4 weeks after surgery, and function is fully restored 6-8 weeks after surgery. Thirdly, for anterior cruciate ligament rupture of the knee joint, arthroscopic surgery is performed to reconstruct the ligament. The joint swelling usually subsides completely in 4-6 weeks, and adherence to functional exercises can lead to complete recovery of the knee joint three months after surgery. To sum up, in order to speed up the recovery after surgery, cold compresses and functional exercises should be insisted on for the joint.