Abstract: The preparation , microst ructure , compressive properties and thermal stability of the glass bead reinforced rigid polyurethane foams ( PUR/ GB) are studied. When the content of the glass bead reaches 10 % , the compressive st rength and compressive modulus of PUR/ GBs reach their maximum , respectively. When glass beads arepret reated with silicane coupling agent , the compressive st rength and compressive modulus improve to a large extent ; the onset decomposition temperature and peak temperature improve to some extent . Analyses by SEM , XPSand EDS reveal that the f roth density of PUR/ GB increases , frothy diameter decreases , the interfacial adhesion between the surface of glass bead and PUR mat rix is good , and glass beads disperse homogeneously in PUR mat rix.These are the reason why compressive properties and thermal stability are enhanced largely.