Development of new type Al alloys containing only low activation elements on 14 Mev neutron irradiation is described. The mechanical strength, ductility, and electrical resistivity so as to maintain features as structural materials of large tokamak are the targets of the development. Three kinds of alloys, namely Al-Mg-Bi, Al-Mg-Li and Al-Li-Mg alloys, are chosen. The first one is a modification of commercial Al 5083 alloy. Another two alloys are newly developed alloys, expecting a prominent role of Li for strengthening of material and raising of electrical resistivity.