As one kind of indoor pollutants, formaldehyde is usually associated with the use of formaldehyde based adhesives. This paper reviewed literatures dealing with formaldehyde emissions from UF resin bonded wood based panels. It analyzed the mechanism of UF resin hydrolysis and formaldehyde release, introduced the toxicology, the limitations, regulations and guidelines, related to formaldehyde. Some methods to reduce formaldehyde emissions were introduced as well.