Recent surface treatment studies show that titanium alloys should have an improved resistance to frictional wear and fatigue strength limit without any loss of their high corrosion resistance. These requirements can be satisfied by producing surface nitrided, oxynitrided and carbonitrided diffusion layers. This paper presents the results of metallographic examinations, corrosion and wear resistance tests, surface chemical composition investigation, as well as rotating and bending fatigue tests. These surface treatments increase the useful properties of the titanium alloy. The influence of treatment time and the thickness of the layers on its properties are also investigated.