A spinal implant structure (100; 200; 400) having a folded position and an expansion position, comprising: a body (110; 210; 410), the body (110; 210; 410) being a hollow-cored cylinder when the spinal implant structure (100; 200; 400) is in the folded position, the body (110; 210; 410) comprising: a first part (111; 211; 411); a second part (112; 212), the second part (112; 212) not overlapping the first part (111; 211; 411); and at least one expansion arm (113; 213; 413); and at least one support arm (114; 214), the support arm (114; 214) having an end connecting with the expansion arm (113; 213; 413) and another end connecting with the second part (112; 212), wherein the first part (111; 211; 411), the second part (112; 212), the expansion arm (113; 213; 413), and the support arm (114; 214) are formed integrally, and wherein the spinal implant structure (100: 200; 400) is designed to be implanted within a vertebral body, characterized in that the expansion arm (113; 213; 413) having an end connecting with the first part (111; 211; 411) and another end being not coupled to the support arm (114; 214) to be a free end; wherein the support arm (114; 214) comprises a plurality of weakened sections so that, in response to a change in a distance between the first part (111; 211; 411) and the second part (112; 212), the support arm (114; 214) bends at the weakened sections and thus drives the expansion arm (113; 213; 413) to move, thereby increasing an included angle between the expansion arm (113; 213; 413) and the first part (111; 211; 411), expanding the spinal implant structure (100; 200; 400), and causing the spinal implant structure (100; 200; 400) to turn into the expansion position. a first part (111; 211; 411); a second part (112; 212), the second part (112; 212) not overlapping the first part (111; 211; 411); and at least one expansion arm (113; 213; 413); and at least one support arm (114; 214), the support arm (114; 214) having an end connecting with the expansion arm (113; 213; 413) and another end connecting with the second part (112; 212), wherein the first part (111; 211; 411), the second part (112; 212), the expansion arm (113; 213; 413), and the support arm (114; 214) are formed integrally, and wherein the spinal implant structure (100: 200; 400) is designed to be implanted within a vertebral body, characterized in that the expansion arm (113; 213; 413) having an end connecting with the first part (111; 211; 411) and another end being not coupled to the support arm (114; 214) to be a free end; wherein the support arm (114; 214) comprises a plurality of weakened sections so that, in response to a change in a distance between the first part (111; 211; 411) and the second part (112; 212), the support arm (114; 214) bends at the weakened sections and thus drives the expansion arm (113; 213; 413) to move, thereby increasing an included angle between the expansion arm (113; 213; 413) and the first part (111; 211; 411), expanding the spinal implant structure (100; 200; 400), and causing the spinal implant structure (100; 200; 400) to turn into the expansion position. the expansion arm (113; 213; 413) having an end connecting with the first part (111; 211; 411) and another end being not coupled to the support arm (114; 214) to be a free end; wherein the support arm (114; 214) comprises a plurality of weakened sections so that, in response to a change in a distance between the first part (111; 211; 411) and the second part (112; 212), the support arm (114; 214) bends at the weakened sections and thus drives the expansion arm (113; 213; 413) to move, thereby increasing an included angle between the expansion arm (113; 213; 413) and the first part (111; 211; 411), expanding the spinal implant structure (100; 200; 400), and causing the spinal implant structure (100; 200; 400) to turn into the expansion position.