A fuzzy adaptive controller with scaler is proposed for a class of uncertain nonlinear discrete-time systems in this paper. The advantage of the design method is that the approximation of fuzzy logic systems does not depend on the structure and the number of the rules in fuzzy logic systems, and the number of updated laws is related to the character and approximation of the approximated functions, which can not only reduce the number of on-line parameters, but also guarantee the states of systems semi-global uniformly ultimately bounded(UUB). Finally, a numerical example is given to illustrate the effectiveness of the proposed method.