The steps for dealing with a broken mercury thermometer are twofold: both indoor ventilation and protective measures to clean up the mercury. When a mercury thermometer is broken, the concentration of mercury in the room rises significantly, so the first thing to do is to open the windows and ventilate the room so that the concentration of mercury in the air decreases, so as to avoid poisoning caused by inhalation of excessive amounts of mercury. Wear a mask and rubber gloves, and collect the mercury with a small spatula or paper towel; do not touch the mercury directly with your hands. If tiny particles of mercury are still present, you can tape up the small particles, put them together in an airtight container or bag, seal it up and bury it in the ground. If you have sulfur powder at home, you can sprinkle some sulfur powder, which can create non-toxic mercury sulfide with mercury, and then just clean it up together. The house where the mercury was broken up, it is best to ventilate the room for 24 hours before moving in.