The composite films including fourcomponent W-C-S-Mo different bias substrate voltage were deposited on Si substrate by a hybrid of magnetron sputtering and DC filtered cathodic vacuum arc (MS/FCVA) technology.Impacts of bias substrate voltage on mechanical properties as hardness,elastic modulus and adhesion force of these different nano-films were analyzed by nano-hardness tester and nano-scratch tester,and impacts of bias substrate voltage on tribological properties in different environments ranging from humid air to vacuum of space were studied by CSM ball-on-disk tester.The results show that hardness,elastic modulus and adhesion force of the film is tend to increase first and then decrease along with increasing of the bias substrate voltage,and the films under substrate bias voltage of -100 V have the best mechanical properties.The W-C-S-Mo films prepared under -100 V bias voltage have excellent tribological properties in both humid air and vacuum environment.Raman test results show that the lubrication of W-C-S-Mo films is significantly supported by DLC in humid air environment,furthermore,the MoS2 crystal particles in soft phases of the film have lubrication function in vacuum environment.