Low back sofa: are lightweight chair type seating. It starts with a strong point for supporting the user's waist (lumbar spine) This sofa backrest height is low, usually around 370 mm away from the seat surface, backrest angle is smaller, is not only conducive to rest, but the entire sofa external dimensions corresponding narrowing. This sofa moving more convenient, lightweight, small footprint.

High back sofa: also known as aviation seat. It is characterized by three fulcrum, people's waist, shoulders, back of the head while leaning back on the surface. The three support points in space does not constitute a straight line, and thus the production of such high technical requirements of the sofa, for later selection when the difficulty is relatively large. Making high-backed wooden sofa, you must explicitly turn good on the shelf surface composed of three points, otherwise it proceeds sofa masked processes it is difficult to ensure that the anchor position, causing discomfort to the user. Pay attention to the back of the purchase of high-back sofa constitute three support points are reasonable, appropriate, can be judged by the test seat. High-back sofa is made of the evolution from the recliner. To improve the performance of the rest, but also to do with footstool, before placing the sofa, the height of the sofa seat with cutting-edge high-identical.

General sofa: sofa in the family with a common one. On the market for this type of multi-sofa. It has two support points supporting the user's lumbar, thoracic, matching can be obtained with the back of the body surface effect. The angle between the backrest and the seat surface of the sofa is of such critical angle is too large or too small will result in the user's abdominal muscles strong, resulting in fatigue. Similarly, the width of the sofa seat surface should not be too large, usually in accordance with the standard requirements of 540 mm, so that the user can easily adjust the leg posture, more comfortable seating.

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