Bioinspired by the spinning of spider silks,the biomimetic preparation of nano-silica/polyurethane(nano-SiO/TPU) elastomeric fibers with distinctive multi-scale microstructures was successfully implemented.The formation mechanism of the nano-SiO_2/TPU fibers was considered as the integrated mechanism of diffusion,coagulation,self-assembly,and microphase separation,same as that of the native spider silks.The mass ratio of nano-SiO_2 to TPU greatly influenced the external and inner microstructures of the nano-SiO_2ATPU fibers.The formation process of the nano-SiO_2/TPU fibers was simply described as three main stages,and the second stage,such as the adding of the ethanol solvents and nano-SiO_2 in different diameters,was thought to be very crucial for the final external and inner microstructures of the prepared fibers.For example,the adding of the ethanol and the nano-SiO_2 spheres in diameter of 10 nm resulted in the existence of many TPU-self-assembled microspheres mostly spaced apart by the nano-SiO_2 aggregates in the nano-SiOVTPU fibers,while the adding of the ethanol and the nano-SiO_2 spheres in diameter of 100 nm resulted in the existence of the nano-SiO_2 spheres,instead of the TPU-self-assembled microspheres,distributed in the nano-SiO_2/TPU fibers. Bioinspired by the spinning of spider silks, the biomimetic preparation of nano-silica / polyurethane (nano-SiO / TPU) elastomeric fibers with distinctive multi-scale microstructures was successfully implemented. The formation mechanism of the nano-SiO 2 / TPU fibers was considered as the integrated mechanism of diffusion, coagulation, self-assembly, and microphase separation, same as that of the native spider silks. The mass ratio of nano-SiO 2 to TPU greatly influenced the external and inner microstructures of the nano-SiO 2 ATP fibers. process of the nano-SiO 2 / TPU fibers was simply described as three main stages, and the second stage, such as the adding of the ethanol solvents and nano-SiO 2 in different diameters, was thought to be very crucial for the final external and inner microstructures of the prepared fibers. For example, the adding of the ethanol and the nano-SiO 2 spheres in diameter of 10 nm resulted in the existence of many TPU-self-assembled microspheres mostly spaced apart apart by the nano-SiO 2 aggregates in the nano-SiOVTPU fibers, while the adding of the ethanol and the nano-SiO 2 spheres in diameter of 100 nm resulted in the existence of the nano-SiO 2 spheres, instead of the TPU-self-assembled microspheres , distributed in the nano-SiO 2 / TPU fibers.