Abstract: Protein foaming agent is produced by the method of Ca(OH)2 hydrolysis using chicken feather as the raw material, and the effects of pretreatment of raw material, mass of Ca(OH)2, hydrolysis time, hydrolysis temperature on the foam performance of the foaming agent are investigated systematically in this paper. The foam performance is further improved by compound modification with the addition of buryl alcohol and viscous substance sodium carboxy methyl cellulose (CMC). At last, the compressive strength and pore structure of foamed concrete prepared by four different kinds of foaming agent is also investigated. Results show that the best process parameters are 10g Ca(OH)2, hydrolysis temperature 110℃, hydrolysis time 2h. The simultaneous addition of 0.2% normal butanol and 0.03% CMC is proved the most effective to the foam stability, which presented its 1h bleeding ratio reducing from 38.89% to 11.59%. 300kg/m3 foamed concrete prepared by modified protein foaming agent with the 28d compressive strength 0.85MPa is founded to have higher strength than the others, and its pores distributed uniformly with the pore size 0.5mm.