Titanium and its alloys have been used in engineering, medicine, aerospace because they have high strength, which remain at high temperature. Also they have well corrosion resistance, low density and some other properties. This paper considers influence of the plasma electrolysis treatment regime on wear of titanium alloy VT-20.  Specimens of titanium alloy (diameter 10 mm, height  15 mm) were carburized for 5 minutes in aqueous solution contained 10 % (wt.) ammonium chloride and 10 % (wt.) sucrose. Temperature of saturation was varied from 700 to 900 °C. Specimens were cooled after treatment in solution or in air. X-ray diffraction analysis was performed to characterize the structure of outer layer. A DRON (type 1) instrument with Ni filtered Cu-K_α1 radiation was operated at 30 kV and 30 mA (l=1,54056 Å). Sliding wear was made at friction machine UMT-01 with schema “pin-on-disk”. Counter-body was disk made of steel 45 hardened to 58–60 HRC. Industrial facility “LITOL” was used as lubricant. Value of normal force was equal to 207 N. Angular velocity of friction was 290 min^-1. Sliding distance was equal to 500 m. Specimen weight loss was determinate  by measure of the difference of mass before and after test. Samples were degreased before weighting at the ultrasonic bath with acetone. Average friction coefficient was determined by formula: α=FxR/Nxr, where F is value of bend sensor force, R is radius of moveable table, N is value of normal force, r is average radius of sliding path. The obtained data are shown at the Table .  The data from table shows that weight loss and friction coefficient are reduced with increase in  treatment temperature. Also, this dependence is observed in both variant of cooling in solution and air. Peaks of titanium on the diffraction pattern of the sample treated at 900 °C and cooled in air aren’t found due to formation of thick oxide layer. The oxide layer of titanium contains one phase rutile. Increasing treatment temperature from 700 to 900 °C leads to grow of crystallite size of oxide layer of rutile from 35 to 54 nm in samples cooled in the solution and to 56,7 nm in one cooled in air.