3-chlorobenzaldehyde chemical properties are more active, long-term in the air is easy to be oxidized by the air into the corresponding benzoic acid and deteriorated (undeteriorated 3-chlorobenzaldehyde is a Chemicalbook colorless liquid, if white solids are observed in the bottle is oxidized to benzoic acid), so it needs to avoid oxidant sealing and stored in a low temperature and dry environment.