A q-discretization of \vi\ algebra is studied which reduces to the ordinary
\vi\ algebra in the limit of q \ra 1. This is derived starting from the Moyal
bracket algebra, hence is a kind of quantum deformation different from the
quantum groups. Representation of this new algebra by using q-parametrized
free fields is also given.Comment: 12 pages, Latex, TMUP-HEL-930