Pure MoS2 coating and MoS2-Ti composite coatings with different Ti content (5 ~ 15wt.%) have been deposited by HTC 750 unbalanced magnetron sputtering system.The structural and mechanical properties of these coatings as a function of Ti content have been studied.SEM analysis show that the pure MoS2 coating reveals a typical porous and worm-like surface structure,the MoS2-Ti composite coatings appear densified and compact microstmcture and coating porosity decrease with an increase of the Ti content.Grazing incidence X-ray diffraction is used to analyze coating crystalline phases.The results show that the pure MoS2 coating is crystalline and the strongest peak is found in the (002) plane then the (100) plane and (110) plane in turn.Analysis of MoS2-Ti composite coatings by XRD reveal only a broad reflection peak between 10-20° 2θ scattering angle range peaked at about 13° which corresponding to the (002) plane,and the broad reflection peak lines are shitted to lower diffraction angles as the Ti content is increased.The results show that MoS2-Ti composite coatings are at least quasi-amorphous and incorporation Ti in the composite coatings is most likely in the space between the S planes,or making junctions between MoS2 lattices.Nanoindentation test show that the hardness and Youngs modulus of the coatings increase with an increase of the Ti content.The hardness values of the coatings increase from 1 to 5.7 GPa,and the Youngs modulus values increase from 27 to 100 MPa.Nano-scratch test is used to measure coating adhesion to the substrate.The results show that the pure MoS2 coating failure is at an average load of 20 mN,Ti doped composite coatings improve their adhesion to the substrate apparently,Ti concentration appears to play an important role in the adhesion behavior of the coatings,the critical loads increase from 60 mN to beyond 110 mN with the increase of the Ti content.The tribological properties of coatings have been tested by ball-on-disc friction and wear tester at a humidity between 30 and 50% in air.The results show that the pure MoS2 coating appears poor tribological behavior which the friction coefficient is about 0.06 and the endurance life is 5850m.MoS2 -Ti composite coatings not only show low friction coefficient but also low wear rates.The friction coefficient of composite coatings is between 0.02 and 0.04,and the endurance life of them improve compared to the pure MoS2 coating.