The zero-field critical temperature and the coherence length in the layered superconductor 2H-NbSe2-xSx (x=O-2.0) were investigated. The zero-field critical temperature decreases with increasing the residual resistivity. This result can be explained in terms of the three-dimensional Anderson localization with the mobility edge below the Fermi level The coherence length as a function of x can be explained by the theory of the anisotropic three-dimensional dirty superconductor. However it shows anomalous behavior when x = 0.6. This may be relevant to the change of the crystal structure or the disappearance of the CDW. The effective mass ratio does not depend on x when x <_0.4.

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