The perovskite-type oxide La0.2Sr0.8CoO3 was prepared by sol-gel process, which particle was irregular cube with particle size between 50 and 60 nm. A novel air electrode for oxygen evolution reaction prepared by using La0.2Sr0.8CoO3 as a catalyst has a current density of 152 mA cm(-2) when the potential is 0.7 V (vs. Hg/HgO) in an alkaline medium (6 mol L-1 KOH) under the air atmosphere. The research results show that n (C6H8O7): n (M) = 1:1, pH = 9, calcination temperature 800 degrees C, 5 h calcination time is the best preparation process conditions. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.