Knees climbing stairs pain walking without pain clinically is mainly caused by chondromalacia patella, knee osteoarthritis early lesions, meniscus injury and other reasons. 1. Chondromalacia patella, generally caused by progressive rupture of patellar cartilage, mostly occurring in young and middle-aged female patients, pain in climbing stairs, kneeling or triggered, pain in patellar friction activities or friction sound can occur under the patella. 2. Early osteoarthritis of the knee joint, mostly occurring in middle-aged and elderly female patients or patients with previous trauma to the knee joint, X-ray shows localized osteosclerosis or hyperplasia. 3. Meniscus injury, usually caused by the posterior horn of the meniscus injury, mostly with a history of knee trauma, combined with the knee MRI can be a clear diagnosis. The knee climbing stairs and walking without pain need to go to the hospital in time to diagnose and treat the cause of the disease, and to treat the cause of the disease, in order to cure the disease as soon as possible or to prevent further development of the disease.