门一般包括固定部分即门框，和一个或一个以上的可开启部分即门扇，其动能主要是允许和禁止出入。自动门除了上述功能外，尚有以下功能：
Doors generally include fixed parts, namely doorframes, and one or more openable parts, namely doorfans, whose kinetic energy is mainly allowed and prohibited. In addition to the above functions, the automatic door has the following functions:
⑴门的启闭机械化、自动化，运行安全可靠。门的启闭实现了电机驱动，大大减轻了出入门的劳动强度和通行效率。由于采用了先进的控制技术和安全保护措施，使出入自动门更加安全可靠。
(1) The opening and closing of doors are mechanized and automated, and the operation is safe and reliable. The opening and closing of the door realizes the motor drive, greatly reducing the labor intensity and traffic efficiency of the entrance and exit. Because of the advanced control technology and safety protection measures, the automatic access door is more safe and reliable.
⑵门的密闭性能和节省能源的性能。自动旋转门无论转到哪个位置对门外都是敞开的，对门内都是关闭的，因此能减少热量损失，减少尘土的侵入，增加了密闭性，节省了能源。其他型式的自动门由于能快速自动关闭门并能调节门扇开启宽度，也增加了其密闭性和节省能源的性能。
(2) Closure performance and energy saving performance of the door. The automatic revolving door is open to the outside of the door and closed to the inside of the door, so it can reduce the heat loss, reduce the invasion of dust, increase the airtightness and save energy. Other types of automatic doors can automatically close the door quickly and adjust the opening width of the door, which also increases its sealing and energy-saving performance.
⑶自动门增强了建筑物装饰美化功能。由于自动门广泛采用了新设计、新装饰材料和新的加工工艺，其造型和结构与建筑物会更协调、更匹配、增强了建筑物美化功能。
(3) The automatic door enhances the decorative and beautifying function of the building. Because of the wide use of new design, new decorative materials and new processing technology, the shape and structure of the automatic door will be more coordinated with the building, more matched, and enhance the beautification function of the building.