Observing　the　alloy＇s　microstructural　transformation　changes　during　rolling　deformation,　from　as-forged　to　75　%,　the　formation　process　of　multiscale　structures　was　revealed.　At　75　%　deformation,　a　preliminary　structure　of　large　size　alpha　p　phases　(alpha　p-L)　+　normal　size　alpha　p　phases　(alpha　p-N)　formed.　EBSD　on　the　75　%　deformed　sample　proved　alpha　p-L　results　from　joined　alpha　phases;　alpha　p-N　emerged　during　rolling.　After　heat　treatment,　alpha　s　phases　precipitated　from　beta　matrix,　developing　normal　size　alpha　s　phases　(alpha　s-N,　aspect　ratio　16.6)　and　short　size　alpha　s　phases　(alpha　s-S,　aspect　ratio　4.2),　respectively　corresponding　to　the　distribution　of　alpha　p-L　and　alpha　p-N,　respectively,　creating　the　complete　multiscale　structure.　This　structure　gives　the　alloy　outstanding　strength-ductility　balance:　1460　MPa　tensile　strength,　8.7　%　elongation,　highlighting　the　importance　of　the　multiscale　structure　for　optimizing　the　alloy＇s　mechanical　properties.