Thes of this article made a two-step experiment on waste particleboards in order to investigate an effective method and the number of possible times waste particleboards could be recycled.In the first step,four methods of reducing waste particleboards back into particles were used including conventional water boiling,water boiling with high pressure,steaming and direct shattering,and were compared.Tests on particle screening values and recycled particleboard properties showed that water boiling was the best treatment method.Based on the results,the second step was to reuse the recycled particleboard from the water boiling treatment again to make particles also by water boiling.Property tests indicated that the once re-utilized particleboard had qualified performance according to the national standard GB/T 4897.5-2003 for load-bearing boards used in humid conditions.Although the twice re-utilized particleboard had lower properties,it still met the requirements for interior applications according to GB/T 4897.3-2003.