Engineering　Computational　Service　Grid　Portal　(ECSGP)　is　an　engineering　computational　environment　for　integrating　design　resources　effectively　by　using　Grid　portal　technology.　For　ECSGP,　the　secure　job　process　by　integrating　proxy　credential,　authentication　trust　level,　and　secure　BPEL(Business　Process　Execution　Language)　engine　is　proposed,　and　the　implementation　technologies　are　analyzed　in　this　paper.　The　research　results　in　this　paper　provide　the　basis　for　constructing　ECSGP.