在经常规方法充分消毒灭菌的手术室内的同一个手术器械台上，放置两组手术器械（暴露组和覆盖组），分别于手术开始后３０ｍｉｎ、６０ｍｉｎ、９０ｍｉｎ随机取样进行细菌培养。结果显示：暴露组空气细菌总污染率高出覆盖组１．１８倍，并且时间愈久细菌阳性率愈高，为手术室内控制感染提供了实验室依据。 Two sets of surgical instruments (exposed group and covered group) were placed on the same surgical instrument table in a routinely sterilized surgical room. Bacteria were randomly sampled at 30min, 60min and 90min after the start of surgery, respectively. The results showed that the total airborne bacteria contamination rate in exposed group was 1.18 times higher than that in the covered group, and the higher the positive rate of bacteria in the exposed group, which provided a laboratory basis for controlling the infection in the operating room.