The optimal pH and temperature, maximum specific degradation rate, half rate constant and flocculation rate for the hybrid cell Foaz were measured in the reaction for the degradation of soybean processing wastewater (SPW) in this study. The optimal pH and temperature for Foaz in SPW were the same as those of its parental strains S accharomyces cerevisiae Y9407 and Rhodobacter sphaeroi des P9479, but the flocculation rate, the maximum specific degradation rate and the half rate constant for Foaz were higher than those of its parental strains. The results suggest that the characteristics of the inter2kingdom fusant Foaz constructed from the protoplast fusion between the eukaryote cell yeast S. cerevisiae and the prokaryote cell photosynthetic bacteria R. sphaeroi des may favor degrading organic pollutant in SPW and removing biomass from the effluent.