When running down the steps the knee joint load is about 3 to 4 times the weight. Normally, you should strengthen the protection of the knee joint. 1. The normal knee joint load bearing is about 35 kilograms, when running down the steps, the knee joint load bearing is 3~4 times of the body weight. If you carry too much weight or carry it for a long time, it will cause wear and tear on the joint cartilage, thus causing damage to the knee joint. 2. When going down the steps, you can let your toes touch the ground first, so that the arch of the foot to increase the buffer distance, you can also hold the handrail of the staircase side of the stairs, which can have a certain protective effect on the knee joints. 3, at the same time in daily life, pay attention to the warmth of the knee joints, to prevent the cold so that the blood circulation of the knee joints become poor, triggering pain, but also by adding some warm measures, such as wearing knee pads, etc., to protect their own knee joints.