Advanced　Ni8W/Ni12W/Ni8W　alloy　composite　substrates　used　in　YBCO-coated　conductors　with　a　strong　cube　texture　and　high　yield　strength　have　been　fabricated,　and　a　CeO(2)buffer　layer　film　was　successfully　deposited　on　the　composite　substrates.　Throughin　situtensile　testing　coupled　with　electron　backscattered　diffraction　(EBSD)　analysis,　the　stability　of　the　cube　texture　of　Ni8W/Ni12W/Ni8W　alloy　composite　substrates　has　been　investigated.　The　stress-strain　curve　shows　that　the　yield　strength　(at　0.2%　strain)　of　the　composite　substrates　exceeds　250　Mpa.　The　orientation　of　grains　and　boundaries　on　the　surface　of　the　substrates　was　almost　unchanged,　while　the　strain　exceeds　0.2%,　which　indicated　that　the　composite　substrates　are　adequate　for　depositing　buffer　layers　and　YBCO　layers　by　the　reel-to-reel　process.