In this study, water hyacinth straw- rubber wood particle composite boards were manufactured as boards using the method used in the wood-based panel industry. The raw material (the leaves and stalk) water hyacinth from Dong Nai river and rubber wood from Trang Bom, Were chosen because of theirs availability in Dong N ai province. In order to study the feasibility of utilizing water hyacinth straw as an alternative raw material for panels, three-layer particle boards were produced by mixing water hyacinth straw with industrial rubber wood particles in a proportion of 40160 (weight of water hyacinth straw lruber wood particle). The experimental technological parameters were: a temperature of 140, 150, 160, 180°C and a pressing time of 11, 13, 16, 19, 21 minute, a pressure of 1.7 Mpa. U-F .adhesive was used (a commercial urea-formaldehyde adhesive was used) for blending the raw materials with a adhesive content of 10 wt percent for core and 13 wt percent for surface layers. The results of discussion show that an optimal composition board is at presstemperature of 165.7°C, presstime of 15.8 minutes, pressure of 1.7 Mpa. The board can reache 14.5 Mpa. of bending Modulus of Rupture (MOR), 0.365 Mpa. of Intenal Bond (IB) and the Thickness Swelling (TS) of the board is 10.54 percent, with 0.7-0.73 specific gravity.