1. Pay attention to the water level of the floor drain to prevent odor. If possible, replace it with a rubber ring odor-resistant floor drain, replace it with an odor-resistant floor drain or install an odor-resistant floor drain core, and add an S-bend to the sink drain or install an odor-resistant floor drain core; 2, buy a coaster, put it on the floor drain, and then take it off when using the floor drain, and cover it when not in use, which can effectively prevent odor; 3, but also pay attention to see whether the washbasin sewer pipe joint is tightly closed.