The standard size of European sofa varies with brand and style, but generally speaking, the width of the front of single person sofa seat should not be less than 480mm；; The size of the double sofa should be above 950mm; The size of a three-person sofa should be between 1400- 1450 mm, and the depth of the sitting surface should be between 480 mm and 550 mm. In addition, the height of the sofa refers to the maximum distance from the ground to the top of the sofa, which is the same concept as the usual "height". The height of the sofa seat surface should be equal to the height of the calf plus the heel of the shoe or slightly lower. The seat height of European and American rich sofas will be between 430 mm and 470 mm, and the best height is between 350 mm and 420 mm due to the figure of Asians.