Liquefied bamboo resin was synthesized with phenol and polyethylene glycol（PEG-400）as a liquefying reagent.Foaming materials were made from the liquefied bamboo resin by adding a surface active agent,curing agent,foaming agent and isocyanate.Effects of mass filling coefficient（MFC）on the structure and properties of the foaming materials were evaluated.The results showed that with increased MFC,compressive strength of the material increased with more uniform cell structure and decreased flame retardancy.However,MFC had little effect on thermal stability of the material.The compressive strength of the foaming material reached 0.15 MPa with a critical oxygen index of 31% when MFC was 2.27,which met the requirement for thermal insulation for exterior wall materials.