We should choose the length of the sofa according to the size of your home. The sitting height, sitting depth and depression of the sofa, which is related to whether you are comfortable to sit up. The height of the sofa is usually between 40cm and 50cm, and the knee and hipbone should be at the same level when sitting.
The sofa with small deep is very unfriendly to the tall people, and the thigh will be partially suspended when sitting, and the leg will not be fully relaxed.