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Carbonnano onions (CNOs) are a kind of novel carbon materials with the unique structure and excellent electrical performance.In this study,we report a convenient preparation of Fe-Ni alloy@CNOs with a regular framework and high purity.Fe-Ni alloy catalyst are prepared from NaBH4 reduction method and we useMgOas substrate to grow CNOsby CVD method.The influence of growth temperature on the structure and morphology of CNOs has been investigated.The Fe-Ni alloy@CNOsprepared at 850 ℃ with a specific capacitance of 50 F·g-1.In addition,the materials exhibit excellent stability and good charge-discharge performance.The Fe-Ni alloy@CNOshas a great potential in the field of application of supercapacitors.