In this article, the relationship between the properties of gypsum particleboard and particle geometry, bark content as well as gypsum quality was discussed The results from the test showed that maintaining the length of wood particles is profitable to enhance the bending strength of the gypsum paticleboard; with the increase of the bark contents in wood partic]es, the bending strength of the board will be declined, but a small amount of barks mixed into wood particles as a filler can increase the strength significantly; the gypsum particleboard produced by different plants have great different properties; the evident relationship between the properties of gypsum-bonded particleboards and the quality of gypsum measured according to the industrial standard of gypsum plaster for building purpose as well as phase composition is not found