Rational　design　of　efficient　and　durable　bifunctional　catalysts　toward　oxygen　reduction　reaction　(ORR)　and　oxygen　evolution　reaction　(OER)　is　important　for　rechargeable　zinc-air　batteries.　Herein,　Mg　doped　perovskite　LaNiO3　(LNO)　nanofibers　(LNMO　NFs)　were　prepared　by　a　facile　electrospinning　method　combined　with　subsequent　calcination.　LNMO　NFs　show　a　more　positive　half-wave　potential　of　0.69　V　and　a　lower　overpotential　of　0.45　V　at　a　current　density　of　10　mA　cm(-2)　than　those　of　the　pristine　LNO　NFs.　As　an　air　electrode　for　zinc-air　battery,　the　cell　with　LaNi0.85Mg0.15O3　NFs　catalyst　is　able　to　deliver　a　high　specific　capacity　of　809.9　mAh　g(-1)　at　a　current　density　of　5　mA　cm(-2).　It　also　shows　an　excellent　cycling　stability　over　110　h　at　a　current　density　of　10　mA　cm(-2).　DFT　calculation　results　demonstrate　that　the　LNMO　surface　binds　oxygen　stronger　than　LNO,　which　contributes　to　enhanced　OER　activity　as　observed　in　our　experiments.　The　results　indicate　that　LNMO　NFs　are　an　efficient　and　durable　bifunctional　catalyst　for　zinc-air　batteries.