To　improve　the　security　capability　for　gird　portal　that　is　accessed　by　ordinary　users　jobs　and　to　guarantee　that　portal　have　a　secure　access　to　gird　resource　is　very　important.　According　to　the　feature　of　grid　portal,　we　design　and　analyze　a　safe　portal　mechanism　with　Globus　Toolkit　middleware　technology　to　implement　an　architecture.　We　achieve　both　a　credential　processing　architecture　and　gird　portal　credential　security　architecture.　The　experiment　result　shows　that　through　this　kind　of　design　and　analysis　of　gird　portal,　we　could　protect　the　safety　of　grid　portal　itself　well.　In　addition,　this　architecture　would　ensure　that　every　grid　computing　resource　that　is　accessed　by　portal　through　grid　can　be　safe　as　well.