Abstract: Objectives The effects of biomass types on the air gasification characteristics of circulating fluidized bed under different parameters were investigated, so as to provide relevant data reference for biomass circulating fluidized bed gasification technology with wide fuel adaptability and biomass gasification coupled coal-fired power generation technology. Methods An experimental study of air gasification with air equivalent ratio（ER） and gasification temperature as parameters and agricultural and forestry waste（rice husk, sawdust, corn stalk and rice straw） as feedstock,was carried out on a small atmospheric circulating fluidized bed. Results The change patterns of syngas components for rice husk, sawdust, corn stalk and rice straw at different air equivalent ratios are basically the same. When the air equivalent ratio increases, both the low calorific value and cold gas efficiency of syngas for rice husk, sawdust, corn stalk and rice straw have an increasing-decreasing trend. For the rice husk, sawdust and corn stalk, ER=0.20 is the optimum operating condition, and the highest cold gas efficiency is respectively 46.19%, 38.07%, and 38.07%.However, for rice straw, ER=0.25 is the optimum operating condition, and the maximum cold gas efficiency can reach 39.55 %. The change patterns of the three combustible gases（CH4, CO, H2） in the syngas components for rice husk,sawdust, corn stalk and rice straw is also consistent at different gasification temperatures. When the gasification temperature increases, the low calorific value and cold gas efficiency of syngas for rice husk, sawdust, corn stalk and rice straw also show an increasing-decreasing trend. For rice husk and corn stalk, T=750 ℃ is the optimum operating condition,and the highest cold gas efficiency is respectively 46.19% and 37.71%. However, for sawdust and rice straw, T=760 ℃ is the optimum operating condition, and the maximum cold gas efficiency can reach respectively 38.07% and 37.56%.Conclusions It can provide relevant data reference for biomass circulating fluidized bed gasification technology with wide fuel adaptability and biomass gasification coupled coalfired power generation technology.