It is best to open the window and ventilate naturally, not less than 3 times a day, half an hour each time; The air disinfection method is as follows: ozone disinfection: seal the whole room, use an ozone generator to generate ozone, make the ozone concentration reach 20mg/m3, and disinfect at RH≥70% for more than 30min. Ultraviolet irradiation: ultraviolet lamps with total wattage ≥ 1.5W/m3 are uniformly arranged in the whole room, and the irradiation duration is more than 30min. Fumigation with peracetic acid: seal the whole room, put the peracetic acid solution in a corrosion-resistant and heat-resistant container, and heat and evaporate. The dosage of peracetic acid is 1g/m3 (5-6ml of peracetic acid solution containing 18% ~ 20% per m3). After fumigation for 2 hours at the relative humidity of 60% ~-80%, open the doors and windows for ventilation. Indoor air is disinfected once a week. Sterilizing books in the microwave oven can really be used to sterilize paper products. It is best to put 1 small glass of water next to books and documents for disinfection, which will make the paper not easy to be burnt and improve the disinfection effect, but the disinfection time should not be too long.