The 100-level operating room refers to the aseptic operating room that needs some important operations such as organ transplantation and heart surgery, and the 1000-level operating room is one of the aseptic operations such as thoracic surgery and plastic surgery. The 10,000-level operating room is the general surgery of gynecology and these minor operations. In fact, it is the operating room divided by the dust level per cubic meter of air in the operating room.