Abstract: In this paper, the identification of-Wiener model with time-delay is considered. Under some special conditions, Wiener model satisfies a group of regressive functions. With the help of Fourier series, values of regress functions in some points can be estimated. Based on these estimation values, the time-delay constant is determined. Furthermore, it is easy to identify parameters of the linear and nonlinear system with a bi-direction linear neural network. A simulation example is calculated to prove the effectiveness of the algorithm.