We present the tau-functions for the hypergeometric solutions to the q-Painleve system of type E-7((1)) in a determinant formula whose entries are given by the basic hypergeometric function W-8(7). By using the W(D-5) symmetry of the function W-8(7), we construct a set of twelve solutions and describe the action of (W) over tilde (D-6((1))) on the set.