1. Save space. After the door is opened, the door leaf is folded in half and opened horizontally, which greatly saves space and is conducive to the design of furniture placement. It is suitable for places with small space and small house type. Due to its folding characteristics, it does not occupy space after opening. 2. Humanized design, with small sliding range, the body can open the door without moving or pushing back, which is more suitable for the disabled or the elderly.