Abstract: The effect of eight selected surfactants on the growth of bacterium strain X_8 and the deoiling effect of strain X_8 from frigon was studied.The results showed that most of the selected surfactants inhibited the growth of the strain X_8.When the concentration of SDS was less than(0.5 g/L,) it had slight effect on the growth of the strain X_8.Addition of(0.5 g/L) SDS in deoiling of frigon by the strain X_8 enhanced the oil-removing effect and the production of lipase. The residual oil content was(11.36%) when the treatment was performed only by(0.5 g/L) SDS and(17.4%) oil was removed;the residual oil content was(7.53%) when the treatment was carried out only by fermentation and(45.3%) oil was removed;the residual oil content was(3.62%) when the treatment was undertaken by fermentation plus addition of(0.5 g/L) SDS and(73.7%) oil was removed.The activity of lipase with and without SDS in the fermentation system was(451 IU/L) and(344 IU/L) respectively.This indicated that deoiling effect was enhanced by washing and promoting lipase production in the fermentation system with addition of proper amount of SDS.