Sedentary as a common cause of lumbar pain or lumbar degeneration causes, in the premise of work inevitably sedentary, must pay attention to protect the correct posture of the lumbar spine. When sitting straight, the lumbar spine withstand about 1.5 times the usual pressure, while leaning forward or backward, the lumbar spine to withstand 2.5 times the pressure, so sitting with the chest and abdomen, sitting right when the pressure on the intervertebral disc is minimal. And in the arm support sitting posture, feet hanging sitting posture, relaxed sitting posture, leaning back sitting posture, leaning forward sitting posture, the disc pressure increases in turn. A good posture, the first need for a comfortable chair, ordinary hard seat back chair can be. Sit down as far back as possible, so that the hips can sit full chair, so that the waist and back completely close to the back of the chair, both feet should be able to flatten the ground, so that the knees are the same height, or higher than the hips. Next, find a comfortable cushion, it is best to fit perfectly with the lumbar spine, the material is slightly hard and has a certain support strength. Lumbar close to the cushion, not just pad not lean. The best sitting posture should do the following: 1, try to relax the lumbar, do not worry about the lumbar spine pressure. Back muscles will automatically correct the physiological curve of the lumbar spine; 2, try to use the lumbar pillow, so that the waist to get a better support, so as to relieve lumbar muscle tension and reduce the pressure on the lumbar spine; 3, try to avoid ambulation, experiments have shown that the greater the angle of the spine forward, the greater the load on the muscles and soft tissues around the lumbar spine, the more likely to cause fatigue of the back and lumbar muscle groups, and even chronic strain injury. Try to keep the upper body upright, the seat and desktop to maintain a suitable distance to ensure that the forelimbs get the desktop and support the back can be well protected by the back of the chair, while keeping the spine in a vertical position.