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Hydrogen-free diamond-like carbon (DLC) films were prepared by means of microwave electron cyclotron?resonance plasma enhanced direct current magnetron sputtering. To study the influence of enhanced plasma?on film fabrication and properties, the structures as well as mechanical and electrical properties of these?films were studied as a function of applied microwave power. Results showed that higher microwave power?could induce higher plasma density and electron temperature. The hardness increased from 3.5 GPa to?13 GPa with a variation of microwave power from 0W to 1000 W. The resistivity showed a drastic increase?from 4.5×104 Ωcm at 0Wto 1.3×1010 Ωcm at 1000 W. The variation of the intensity ratio I(D)/I(G) and the?position of the G-peak of the DLC films with respect to changes in microwave power were also investigated?by Raman spectroscopy.