The morphology and size distribution of the filler in Thordon matrix were observed.Water absorption behavior and tribological properties of Thordon SXL composite in both pure water and sea water were studied and the influence of lubricant media,applied load and velocity on tribological performance of Thordon SXL were illuminated.The results show that water absorption behavior of Thordon SXL immersed in both pure water and sea water can be fitted to Langmuirtype model.A greater absorption rate was measured for Thordon SXL specimens immersed in pure water than in sea water,while a better lubrication effect was obtained for Thordon SXL in sea water than in pure water under same test conditions.A regular ripple pattern is exhibited on the worn surface when Thordon SXL composite sliding against 316SS under the lubrication of sea water and pure water.The formation of abrasion pattern is a result of competition equilibrium between plough effect and friction heat effect on the counter face.