A series of four fire retarders denoted by WFR was developed and the processesfor producing fire-retardant wood,plywood,particleboard and MDF were investigates,Thefire retarders were low toxic,decay-resistant and less leachable. The treated wood and panelshad excellent fire-resistant properties and good physi-mechanical properties. Besides,the re-lease of formaldehyde from panels was very low.