Modern advanced purification technique has been widely used in operating room, delivery room, central infant room, burn wards, ICU, hemodialysis room, central supply room, drug factory and so on by hospitals of all levels. The data of foreign hospitals indicate: thanks to the purification technique, the infection rate after operation is lowered from 8.9% to 0.26%, while the adoption of super-purification makes the infection rate after operation to be 0.1% only.