Paraformaldehyde is a chemical that is often used in a variety of practical applications. Its role refers to the function or role it plays in a specific environment. Paraformaldehyde can be used to prepare resin materials, such as building plywood, density board, etc., to make it have better strength and durability. In addition, polyformaldehyde can also be used as a preservative in the processing of paper, fabrics and other materials to extend their service life. In the field of medicine, paraformaldehyde is used as a material for drug controlled release systems, which can achieve sustained slow release of drugs and enhance drug efficacy. However, it should be noted that due to the volatility of polyformaldehyde, long-term exposure to high concentrations of polyformaldehyde will have a negative impact on human health. Therefore, when using paraformaldehyde, the relevant safety standards should be strictly observed to ensure the health and safety of personnel. To sum up, paraformaldehyde is a chemical with a variety of applications, with a wide range of actions, and plays an important role in different fields.