In　recent　years　the　engineering　accidents,　especially　those　occurred　to　large-scale　public　projects　were　paid　more　and　more　attention　by　engineers　and　even　the　normal　public.　The　large-scale　public　projects　involved　such　numbers　of　participants　and　complicated　procedures,　which　challenge　to　the　traditional　project　security　management.　There　is　should　be　anew　method　to　do　with　the　modern　engineering＇s　risk　manage　requirement.　This　article　summarized　the　risk　factors　in　all　the　engineering　process　as　the　risk　theoretical　research　foundation.　In　this　paper,　considering　the　disadvantages　of　disseverment　and　isolation　each　engineering　process　stages　of　traditional　engineering　risk　management　method,　the　idea　of　project＇s　life-cycle　method　is　introduced　in　the　risk　analysis　for　improvement　the　traditional　disadvantage.　This　article　also　shows　how　to　determine　the　risk　sources　and　the　risk　liability　by　analyzed　the　stages＇　risk　possibility　of　project　life-cycle.　These　works　will　help　to　build　up　an　analysis　basement　for　engineering　risk　control　research.　©　2010　IEEE.