Hydrogenated diamond-like carbon (H-DLC) were deposited on GCr15 bearing steel by double cathodes pulse glow discharge (DCPGD) plasma vapour deposition at different gas volume ratios. The surface morphology, composition, microstructure, hardness and friction properties of the H-DLC films were observed. It was found that the sp 3 bond content and I(D)/I(G) ratio of DLC films were between 58 and 61% and in the range of 0?68-0?88, respectively. When H 2 : Ar : C 2 H 2 gas volume ratio ranges from 4 : 1 : 1 to 8 : 1 : 1, the I(D)/I(G) ratio decreases with an increase in the sp 3 bond content, the friction coefficient (about 0?1) and wear rate (between 4?5610 28 and 8?4610 28 mm 3 N 21 m 21 ) of DLC films were very low. In this study, when H 2 : Ar : C 2 H 2 gas volume ratio is 6 : 1 : 1, the thickness of the film is 8?13 mm deposited for is 4 h, the hardness reaches a maximum value (22?5 GPa), the friction coefficient and wear rate reduce to a minimum value, 0?094 and 4?5610 28 mm 3 N 21 m 21 , respectively.