The plasma standard of ten thousand people operating room is that the number of dust particles in air per cubic foot is ≥0.5 μm≤ 10000 or ≤350 per liter of air. The number of dust particles in air per cubic foot is ≥0.5 μm≤ 1000 or ≤35 per liter of air. The standard of 10,000-level laminar flow operating room is that the number of dust particles per cubic foot is ≥0.5 μm≤ 10000 or ≤350 per liter of air. Operating rooms have different levels, such as 10, 100, 1000, 10000, and the design requirements of operating rooms at all levels are also different.