Based on water-gas shift reaction mechanism and perovskite compounds characteristics, La_(1- x )Ce_ x FeO_3 (.K) perovskite were designed and prepared as shift catalysts. DTA and XRD results reveal that La_(1- x )Ce_ x FeO_3 can be formed at 730～760 ℃ by mechanic-mix thermal decomposition method. Activity and heat-resisting tests show that La_(1- x )Ce_ x FeO_3 ((.K)) possess high thermal stability if x is less than or equals to 0.5. But when x is greater than 0.5, La_(1- x )Ce_ x FeO_3 (.K) will be converted into ceria and magnetite partially or completely under shift reaction conditions. In the case of x =0.5, the conversion of CO is about 68% at 530 ℃. Potassium can greatly improve the low temperature activity, but slightly reduces the high temperature activity, and has little impact on the thermal stability. La_(0.5)Ce_(0.5)FeO_3 (.K) is a promising chromium-free high temperature shift catalyst. Based on water-gas shift reaction mechanism and perovskite compounds characteristics, La 1- (1-x) Ce x FeO 3 (.K) perovskite were designed and prepared as shift catalysts. DTA and XRD results reveal that La 1-x Ce x FeO 3 Activity and heat-resisting tests show that La_ (1- x) Ce_xFeO_3 ((.K)) possess high thermal stability if x is less than or equals to 0.5. But when x is greater than 0.5, La 1- (1-x) Ce x FeO 3 (.K) will be converted into ceria and partially or entirely under shift reaction conditions. In the case of x = 0.5, the conversion of CO is about 68% at 530 ° C. Potassium can greatly improve the low temperature activity, slightly slightly the high temperature activity, and has little impact on the thermal stability. La_ (0.5) Ce_ (0.5) FeO_3 (.K) is a Provided chromium-free high temperature shift catalyst.