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 The three laws of a hard day home, the first action is itself thrown into a soft and comfortable sofa, it feels like to be warm embrace. Lying vertical lying lazy, happy jumping up and down. Sofa furniture, the closest being the case, the selection of sofa can not be too casual. Holds an important position in the sofa at home, the stress quite a lot. Law of a comfort out busy, back home we should enjoy each joint of the body's need to find a place to easily stretch, sitting in a soft and comfortable on the sofa is the most appropriate. The size of various parts of the sofa should be ergonomically suitable for the surface of the body's physiological structure as well. If the room is smaller, both sit-functional sofa bed is a good choice. Sofa seat height should be equal to the human leg with the heel height or slightly lower than the height of about 35-42 cm. Such as seat is too high, will make his legs dangling, the weight of the torso pressure in the legs, tight back muscles, over time the muscles of the legs and back will feel the pain unbearable; such as low back muscles did not in a natural state, will reduce the bearing surface of the thighs, a long time, will feel muscle soreness. The single front of the sofa seat width of not less than 48 cm; sofa in more than 95 cm; three of the sofa should be between 140-145 cm, seat depth should be between 48-55 cm. When the body by sitting on the sofa to the extent possible, appropriate outside of the knee still sofa surface. If the sofa to sit deep too much, sit down, the back can not be completely attached to the back of the couch on, so that the waist to the lack of effective support and waist muscles have been tense contraction to maintain posture, a long time will lead to strain of lumbar muscles. The height of the rear backrest to sit down between shoulder and ear appropriate date to the backrest at the top of about 68-72 centimeters from the ground. There are many people like to use the high back sofa, in fact, not science. Because people's shoulder leaning against the high back, waist, back and backrest to be some distance away, the body and the sofa, the contact surface but less so, sit not on how long will the waist, back, nowhere to rely on fatigue. In this regard, the low backrest sofa has obvious advantages, as people sat on the sofa in the back of the body almost entirely rely on it, contact area, and physical comfort, posture also seems graceful and gentlemanly. After the backrest tilt while between 100-108 degrees is appropriate. The height of handrails on both sides in the range of 62-65 cm. 
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