Before indoor formaldehyde treatment, what specific work needs to be done is as follows: 1. Guarantee that the power supply in the area under treatment is connected. Because the power supply is needed during treatment, it is necessary to ensure that the power supply before treatment is connected. 2. Guarantee the opening of the water supply to be treated or close to the area. Although the water consumption is not large and necessary when the treatment is started, it is better to guarantee the opening of the water supply if it is convenient to open the water supply, which can facilitate the cleaning of the relevant spraying equipment before, during and after the treatment or dilution of the treatment solution. 3. Before the treatment, it is better to clean the room once, because the treatment solution is finally attached to the treated surface to play its function of sweeping away. If there is too much dust on the treated surface, it will affect the treatment effect.