It is urgent to solve the problems of the dramatic volume expansion and pulverization of SnO2anodes during cycling process in battery systems.To address this issue,we design a hybrid structure of N-doped carbon fibers@SnO2 nanoflowers(NC@SnO2)to overcome it in this work.The hybrid NC@SnO2is synthesized through the hydrothermal growth of SnO2nanoflowers on the surface of N-doped carbon fibers obtained by electrospinning.The NC is intro-duced not only to provide a support framework in guiding the growth of the SnO2nanoflowers and prevent the flower-like structures from agglomeration,but also serve as a conductive network to accelerate electronic transmission along one-di-mensional structure effectively.When the hybrid NC@SnO2 was served as anode,it exhibits a high discharge capacity of 750 mAh g-1at 1 A g-1after 100 cycles in Li-ion battery and 270 mAh g-1at 100 mA g-1for 100 cycles in Na-ion battery,respectively.