1, the scientific dimension to comfort in the selection, do not blindly consider the appearance and color of the sofa bed, the comfort is also very important, and this is reflected in the size. The size of various parts of the sofa should be adapted to the curve of human physiological structure, ergonomic, so both will sit more comfortable. About the width and length are most concerned about two issues, there is no clear standard, the only basis is based on the actual use of the human situation to be, for example, two people sleep then do not choose 1.4 or less wide sofa bed, it will make people sleep it is no comfort. 2, a solid structure to the frame structure is easy to use sofa bed frame, a sturdy frame of its rugged basic protection. If the sofa bed with wooden frame, it is best to uncover the base interlining view, to see the wood is smooth, good wood frame should be no insects, scars, rotten marks. Currently, sofa bed & quot; & ldquo; variant way & rdquo; mainly & ldquo; flip & rdquo; and & ldquo; push-pull & rdquo; two kinds. No matter which kind of way, & ldquo; variants & rdquo; process, should feel smooth, moderate resistance, high stability after each section in place. 3, do not be too soft due to the spring mattress sofa bed and a sofa bed for both purposes, and therefore its mass-spring mattress and comfort is essential. Not the more soft spring mattress is better, feel soft and hard moderate mattress can be uniformly dispersed body weight, strengthen their ability to support the spine, relieve fatigue played a role. In addition, good ventilation can not be ignored, this feature can make spring mattress to maintain good health. If the sofa and do a comparison, it should be selected sofa soft texture, and a sofa bed will have to choose more rigid texture. 4, fabric choice is currently the main sofa bed fabric PU leather and fabric are two kinds of fabric sofa bed pricing is generally low, but there is take care of the trouble, and short lifespan, generally used for rental housing and other environments. Sofa bed for personal use try to use PU leather, texture and feel more superior, although the price is about twice as expensive than cloth, but life is generally 3-5 times the fabric sofa bed. However, PU can be divided into several, to try to choose PU leather, breathable environmental performance and better environmental protection classes. 5, work to fit naturally fit the degree of engagement between the fabric and the contents. Good work should be smooth, crisp, armrest and seat surface, the transition between the backrest should be natural, smooth, no wrinkles. Especially if the sofa bed in the design of some position with the arc, but should look carefully to see whether the sleek and smooth cloth. In addition, the cloth on the color of the stitching should also pay attention to see the pattern in the stitching of two different positions whether coordination, if it is striped, twisted and inclined to pay attention to the existence of a stripe. Finally, to stress that the industry is a common sense, the same materials and processes, different sewing products made out of poor quality is the day to another, so try to choose products in Guangdong Province, to enter into the rest of the same fabrics and hardware but how many can not find a good turner. & Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp;