Geographical　knowledge　grid　is　a　platform　which　utilizes　grid　computing　technology　and　geo-information　science　to　supply　powerful　spatial　knowledge　discovery　and　sharing　ability.　Due　to　the　complexity　of　knowledge　grid,　we　design　a　portal　named　as　GeoKS-Grid　Portal　as　the　access　point　to　the　platform.　This　paper　describes　the　design　and　development　procedures　and　introduces　the　framework　of　the　portal,　which　consists　of　data　sharing　and　management　module,　platform　monitoring　module,　grid　task　execution　module,　geographical　knowledge　service　module　and　portal　administration　module.　This　paper　also　displays　the　application　of　the　portal　in　air　pollution　dispersion　simulation　of　Xiamen　City.