The enrichment behaviors of sodium dodecylsulfate (SDS) and bovine serum albumin (BSA) in SDS/BSA mixed aqueous system have been studied by the method of foam fractionation. The effect of the interrelation of the two components at the air/Wator interface on foam behaviors has been discussed. The experimental results indicated that the foam properties and enrichment in mixed systems were different from that in the system that two components alone. At low SDS concentration

the enrichement ratio of SDS and BSA were higher by foam fractionation; at high SDS concentration the enrichment ratio of the two components were reduced.