Oxygen carriers (OCs) with perovskite structure are attracting increasing interests due to their redox tun-ability by introducing various dopants in the structure.In this study,LaNixFe1-xO3 (x =0,0.1,0.3,0.5,0.7,1.0) perovskite OCs have been prepared by a citric acid-nitrate sol-gel method,characterized by means of X-ray diffraction (XRD) analysis and tested for algae chemical looping gasification in a fixed bed reac-tor.The effects of perovskite types,OC/biomass mass ratio (O/B),gasification temperature and water injection rate on the gasification performance were investigated.Lower Ni-doped (0 ≤ x ≤ 0.5) per-ovskites crystalized in the rhombohedra system which was isostructural with LaNiO3,while those with composition 0.5 ≤ x ≤ 1 crystalized in the orthorhombic system.Despite the high reactivity for LaNiO3,LaNi0.5Fe0.5O3 (LN5F5) was found to be more stable at a high temperature and give almost as good results as LaNiO3 in the formation of syngas.The relatively higher syngas yield of 0.833 m3·kg-1 biomass was obtained under the O/B of 0.4,water injection rate of 0.3 ml·min-1 and gasification temperature at 850 ℃.Continuous high yield of syngas was achieved during the first 5 redox cycles,while a slight decrease in the reactivity for LN5F5 after 5 cycles was observed due to the adhesion of small grains occur-ring on the surface of OCs.However,an obvious improvement in the gasification performance was attained for LN5F5 compared to raw biomass direct gasification,indicating that LN5F5 is a promising functional OC for chemical looping catalytic gasification of biomass.