Because the translation period of O-O in the [SiO4] hexagonal grid of tetrahedron is different from that of O(OH)-O(OH) in octahedron, and there is incoordination between the two basic unit layers, a crimped shape of magnesium-oxygen octahedron in the outer layer and silicon-oxygen tetrahedron in the inner layer is generated in ChNTs in order to overcome the disharmony between the two basic unit layers, and finally ChNTs present a fiber tube structure