We prepared nano-sized La1-xSrxMnO3 (x=0.2~0.5) cathode catalyst for the zinc air secondary batteries by citrate method and measured cathode’s electrochemical characteristics according to content of strontium compose the cathode catalyst. We heat treated the prepared precursor at various calcination temperature (500~900), and examined the optimum calcinations temperature by XRD analysis and electrochemical evaluation. We examined the ORR (oxygen reduction reaction) and OER (oxygen evolution reaction) performance of the prepared La1-xSrxMnO3 catalyst powder. La0.7Sr0.3MnO3 and La0.8Sr0.2MnO3 catalyst has shown the best performance in the ORR. But in the OER, La0.7Sr0.3MnO3 catalyst has shown better performance. When we consider ORR and OER performance simultaneously, La0.7Sr0.3MnO3 catalyst has shown the best performance because of its lowest voltage difference between charge and discharge.