In order to improve waterproof performance of foamed wall materials made of liquefied bamboo resins,hydrophobic agents were selected to treat foamed wall materials by blending with other reagents during reaction process or spraying on material surfaces.Effects of the hydrophobic agents and their usage on properties of the material samples were evaluated.The results showed that compressive strength and hydrophobic performance of the samples were both improved by blending the hydrophobic agents with other reagents during the reaction process.When 3% of y-aminopropyl triethoxysilane（KH-550） or 5% of y-（2,3-epoxy propoxy） propyl trimethoxysilane（KH-560） were used,the hydrophobicity of the samples reached the hydrophobic level and the compression strength met the requirements of LY/T 2484—2015 General technical requirements of liqufied bamboo foamed composites.When the hydrophobic agents were sprayed on the surfaces of the samples,the hydrophobicity of the samples could reach to super-hydrophobic level with little effect on the compressive strength.