By using the surfactant as washing agent,we found,if the concentration of PT surfactant/Electrolyte M or N/Water was 0.1～1.0 g /2.0 g or 1.5 g/100 g,the oil on the surface of washed fibre was reduced by lower than 13 mg oil/1.0 g fibre,the washout rate was above 99 %.The process of washing by surfactant removing oil from the surface of hy drophobic fibre.It was also discussed theoretically in this paper.