As　the　Campbell　diagram　is　used　to　evaluate　the　strength　of　blades,　it　predicts　false　resonant　points.　This　causes　difficulty　in　blade　design　in　engineering.　To　overcome　the　deficiency,　a　new　approach　was　presented.　Based　on　the　finite　element　computation　of　the　fundamental　frequencies　and　modes　of　blade　assembles,　by　using　the　SAFE　Diagram,　the　dynamic　strength　of　blade　is　evaluated　in　the　way　of　finding　out　the　real　resonant　points.　The　application　example　showed　that　the　proposed　procedure　can　be　used　in　the　stage　of　blade　design　or　in　accident　analysis　of　blades.