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