Objective:To study the structure and wettability changes on the surface of soft-lining material after being treated with low temperature plasma of Ar. Methods: 32 specimens were prepared and 16 specimens were treated with Ar plasma for 20 minutes in plasma equipment.Surface structure and wetting angle were evaluated before and after plasma treatment.Results:(1) The number of C -H was reduced, which indicated crosslinked layer was formed on the surfac‘soft-lining material. (2 The percentage of C-0 increased from 23.56% to 26.18%.③The wetting angle was reduced significantly. Conclusion: Treatment of Ar Plasma can change the surface structure and wettability of soft-lining material.