There are many ways to relax the knee joint, starting with flexing the knee joint in the supine position and placing a loose pillow underneath to keep the muscles around the knee joint in a relaxed state. Then, if possible, you can take a warm water bath to promote relaxation of the muscles around the knee. If the muscles around the knee joint feel tense and fatigued for a long time, it is best to go to the hospital for an examination to rule out meniscal damage, osteoarthritis, or chondromalacia of the patella and a series of other problems in the knee joint. If there are no major problems, the patient can reduce exercise appropriately to achieve the purpose of relieving knee tension. Combined with appropriate baking, intermediate frequency and microwave therapy, this can be effective in relieving knee tension.