In this paper, anode plasma electrolytic saturation with nitrogen and carbon was applied for increase in wear resistance of titanium alloys. Anode plasma electrolytic carburizing (PEC) of commercial pure titanium (CP-Ti) in aqueous electrolytes containing ammonium chloride (10 wt.%) and one of the different organic components (10 wt.%) are considered. Surface layer of CP-Ti after PEC contains oxide TiO2 (rutile) and solid solution of carbon in titanium [1]. The maximum hardness of carburized titanium (340 HV50) is reached in an acetone-base electrolyte followed by quenching; approximate microhardness is obtained in the electrolyte with glycerol. The lowest value of 290 HV is observed in ethylene glycol electrolyte. The surface layer hardness is suggested to determine by the carbon concentration which is associated with electrolyte composition. Anode dissolution results to smoothing of the surface profile and a decrease in roughness. AFM surface analysis shows that the greatest reduction in the surface roughness is observed after the anode PEC in the electrolytes with glycerol and ethylene glycol. Distribution of irregularities on the treated surfaces is normal in contrast to the untreated surface. The smallest deviation profile by maximum value (125– 175 nm) occurs after PEC in the ethylene glycol-base electrolyte. This deviation for the electrolytes with glycerol or acetone is 150–200 nm. The highest deviation profile (325–375 nm) is obtained in the sucrose-base electrolyte. A pin-on-disc tribometer was applied to evaluate friction coefficient of the untreated and treated samples at lubricated conditions (engine oil “LITOL”) with 312 N normal load, 0.49 m/s sliding speed, and 500 m sliding distance with hardened steel (50 HRC) disk as counter pins. The anode PEC of CP-Ti is carried out at 850 ^oC for 5 min followed by quenching in the same electrolyte. Friction coefficient of CP-Ti in all cases diminishes from 0.3 (raw sample) to 0.2 after PEC. Wear rate of PEC CP-Ti samples decreases by 3 orders. Sliding distance corresponded to primary stage (early run-in period) is about 100 m for all samples. Secondary stage (mid-age process) for the untreated sample is observed on the sliding distance from 100 m to 400 m, further the sample is subjected to rapid failure. The greatest decrease in the wear rate is observed after PEC in a sucrose electrolyte which does not correlate with the microhardness of the hardened layer. It can be assumed that the improvement of wear resistance is achieved by a combined action of the oxide layer and the sublayer with high hardness. For comparison, the cathode nitrocarburising of CP-Ti in carbamide-based electrolyte results in the higher surface microhardness of 800 HV (700 ^oC, 9 min) and decrease in the weight loss after wear testing 17 times [2].   Anode plasma electrolytic nitriding (PEN) of alpha- and beta-titanium alloy VT22 is carried out in ammonia-based electrolyte. Results of wear tests show that friction coefficient of nitrided samples decreases at all PEN temperatures. The minimum friction coefficient of 0.12–0.14 is achieved at lower nitriding temperatures of 650–750 ^oC. This coefficient decreases in a much lesser degree at lower load (105 N) and sliding speed (0.144 m/s). Weight loss of nitrided samples after their wear test reduces by 4 orders at higher normal load (208 N) and sliding speed (0.49 m/s) in comparison with untreated samples. The PEN temperature also slightly affects the weight loss in this case. The best results are obtained after PEN at 650 ^oC. We can assume that enhancement of wear resistance is achieved by the combined action of the oxide layer and the sublayer with high hardness.   This work was financially supported by the Russian Science Foundation (Contract No. 15-1920027) to the Nekrasov Kostroma State University.