The patella belt refers to a protective device for protecting people’s knee joints, which is composed of cloth and rubber hoses or EVA shaped strips to prevent meniscus displacement of the patella Extensive. The knee is not only an extremely important part in sports, but also a fragile and easily injured part, or an extremely painful and slow recovery when injured. In normal life, the patella can move normally in a small area on the knee as it is not affected by external forces and does not exercise vigorously, The patella belt can fix the patella to a certain extent, reduce meniscus wear, and use it in various sports can reduce meniscus wear. The patella belt has three main functions, one is to fix the patella, the second is to reduce meniscus wear, and the third is health care. The knee part is very easy to be injured when it is not fully warmed up and exceeds the limit of the body. Many knee joint diseases are related to the meniscus, especially when hiking, ball games, and intense sports damage the knee joint. Patella is the largest seed bone in the human body. It is embedded in the quadriceps tendon and is a triangular flat bone. It is not connected to other bones. The patella may be displaced during intense exercise. The patella belt can stabilize the patella. The characteristics of the meniscus determine the wear that may be brought about in motion. The patella belt plays a big role at this time. The rubber hose in the middle of the patella belt has requirements for softness and thickness. If it is too soft, it will not reduce the wear. If it is too hard, it will wear to the skin of the lateral patella. The hose of the patella strap is worn midway between the tibia and the femoral ankle, that is, outside the meniscus.