Elderly people are vulnerable to various diseases as their body functions and immune system are declining due to ageing. Knee pain is a common symptom of old age, which brings great pain to the elderly in their later life. 1, timely rest, prevent overwork, less weight bearing, frequent activities, pay attention to prevent further wear and tear on the knee joint, avoid long and frequent up and down the stairs, running, climbing and other exercises that are more wear and tear on the knee joint, to avoid sprains and bruises. 2. Keep the knee joints warm and avoid stimulation by cold and humidity; those who are too obese should reduce their body weight and use crutches to help share the weight of both knees if necessary. 3, in daily life and work to minimize the weight of the joint, you can practice gentle and moderate activities, try to avoid half squatting position. Functional exercise of the knee joint, especially the quadriceps exercise, of course, to keep the knee joint in the case of no or less weight-bearing, the method is simple and easy: sitting on the edge of a chair, straighten the leg forward, heel on the ground, then straighten the leg upward, is the heel 10-15 cm from the ground, let the quadriceps muscle continued to contract, hold for 3-5 seconds, and then slowly put the leg down. Do it 2-3 times a day, each time repeat 10-15 times, both legs can be done at the same time. At the beginning of the exercise can not be weighted or less weighted, and then can be appropriate to increase the weight or extend the time according to personal circumstances. The quadriceps is a large muscle group in front of the thigh, and strong quadriceps can play an important role in stabilizing the knee joint. These health care methods for older people are also applicable to young and middle-aged people. If some older people suffer from long-term knee pain, they should consult a specialized doctor at a regular hospital for consultation and advice to get the best treatment plan.