A fusing structure and method of an aero-engine under a fan blade out load, wherein the aero-engine comprises a fan rotor (100), a stator part intermediate case (9), a first bearing (3) and a second bearing (4) supporting the fan rotor (100), a first support cone arm supporting the first bearing (3) on the stator part intermediate case (9), and a second support arm (13) supporting the second bearing (4) on the stator part intermediate case (9); the first support cone arm being of a thin-wall annular structure and comprising an upper cone arm (2) and a lower cone arm (1), the upper cone arm (2) having an upper junction surface (21), and the lower cone arm (1) having a lower junction surface (11); one of the upper junction surface (21) and the lower junction surface (11) being a concave spherical surface while the other one being a convex spherical surface; the upper junction surface (21) and the lower junction surface (11) are complementary and welded into a fusing structure with strength being lower than that of a parent material, the spherical surface center of the fusing structure being located at the axis (12) of the fan rotor (100).
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