Abstract: The influence of atmospheric pressure plasma jet treatment on dyeability of the back and face of wool fabric was investigated and the penetration of its etching into wool fabric was studied.After Helium atmospheric pressure plasma jet treatment of wool fabric,the dyeability of control and treated fabrics was measured.By comparing K/S value of control and both surfaces of treated fabric,the influence of processing parameters of atmospheric pressure plasma jet on modification of both surfaces was studied.The effect of plasma parameters such as treatment time,jet-to-substrate distance and substrate speed on penetration of plasma etching into wool fabric was investigated.It was demonstrated that plasma treatment time and jet-to-substrate distance has influence on penetration of atmospheric pressure plasma jet etching into wool fabric,while substrate speed has no considerable effect on it.