Four　different　weld　shapes　were　obtained　by　choosing　appropriate　electron　beam　welding　parameters,　which　are　respectively　named　as　bell　shape,　funnel　shape,　nail　shape,　and　wedge　shape.　Fatigue　examinations　of　the　electron　beam　welded　joints　with　different　shapes　were　carried　through.　The　influence　of　weld　shape　on　fatigue　performance　of　the　joints　was　synthetically　evaluated　by　analytic　hierarchy　mathematical　model.　The　results　show　that　weld　shape　effects　fatigue　property　of　the　joint　by　electron　beam　welding.　The　sequencing　of　fatigue　performance　of　the　joints　with　four　different　shapes　by　analytic　hierarchy　process　is　bell　shape,　funnel　shape,　wedge　shape,　and　nail　shape.　It　is　validated　by　practical　trial　results　that　the　analytic　hierarchy　mathematical　model　is　effective　and　practical.