LaxSr1-xCu0.1Mn0.9O3-delta (LNF-x) (0.1 <= x <= 1) nanofibers are prepared by electrospun method. The structure of LNF-x and the electrochemical properties of LNF-x in 1 M Na2SO4 aqueous electrolyte are investigated. As a result, LNF-x nanofibers present a perovskite structure, and the LNF-0.5 sample exhibits the highest specific capacitance value of 464.5 F g(-1) at a current density of 2 A g(-1). The maximum energy density of 64.5Wh kg(-1) are achieved at a power density of 2 kW kg(-1) for the symmetric supercapacitor prepared by La0.5Sr0.5Cu0.1Mn0.9O3-delta nanofibers. More importantly, this symmetric supercapacitor also shows an excellent cycling life after 2000 charging and discharging cycles. Those results offer a suitable design of electrode materials for high-performance supercapacitors. (C) 2015 Elsevier B.V. All rights reserved.