The　rigid　nature　of　sealing　glass-ceramics　restricts　the　thermal　cycling　stability　of　Solid　Oxide　Fuel　Cells　(SOFCs),　which　thus　evokes　an　interest　in　designing　a　sealing　glass　without　crystallization　under　the　operational　condition　of　SOFCs.　In　this　paper,　we　report　that　the　sealing　performance　of　30Na(2)O-70SiO(2)　(in　mole%)　glass-ceramic　can　be　significantly　improved　by　Fe2O3　dopant　through　a　composite　approach.　In　particular,　the　crystallization　in　glass　can　be　suppressed　by　appropriate　Fe2O3　dopant　amount　(8　mol%),　which　results　in　the　improved　sealing　property　of　glass.　In　addition,　the　glass　modified　with　Fe2O3　shows　good　chemical　compatibility　with　8　mol%　yttria-stabilized　zirconia　(8YSZ)　electrolyte　and　metallic　interconnect　(430　stainless　steel)　in　dual　atmospheres.　The　possible　mechanism　for　the　improved　sealing　performance　of　30Na(2)O-70SiO(2)　glass-ceramic　by　this　unique　composite　approach　is　also　discussed.