The common causes of knee vibration include synovitis, degenerative changes in the knee joint and chondromalacia patella. 1. Synovitis: caused by knee sprains and a variety of intra-articular injuries, resulting in joint fluid can not be generated and absorbed normally, the knee joint produces fluid, there is a feeling of ZiZi vibration. 2. Degenerative changes in the knee joint: due to frequent heavy labor, the cartilage in the knee joint is worn out, resulting in vibration. 3. Chondromalacia patella: due to long-term chronic strain or cold in the knee joint, the patellar cartilage is damaged and degenerated, resulting in increased friction and vibration during activities. Touching the knee will have ZiZi vibration, may also be caused by other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor for standardized treatment.