We　report　the　synthesis　and　characterizations　of　Poly(ethylene　glycol)　(PEG)　modified　P2O5-CaO-SiO2　gel　bioglass.　Three　kinds　of　PEG　with　different　molecular　weight　(400,6　000,10　000)　were　used　in　the　preparation　and　their　influence　on　the　nanostructure　of　the　resultant　gel　bioglasses　was　investigated.　Due　to　the　excellent　aqueous　solubility　and　compatibility　of　PEG　with　the　inorganic　P2O5-CaO-SiO　2　components,　no　phase　separation　was　detected　in　the　hybrid　gel　glasses　under　scanning　electron　microscopy　(SEM)　observation.　FT-IR　spectra　indicate　that　hybridization　between　the　organic　and　inorganic　part　was　successfully　achieved　at　the　molecular　level.　SEM　images　and　N2　adsorption-desorption　experiments　show　that,　among　the　three　samples,　S6　000　is　the　most　promising　candidate　for　bone　scaffold　material,　because　of　its　hierarchical　pore　structure,　high　porosity　and　surface　area.　©　(2011)　Trans　Tech　Publications.