Abstract: Problems ot analysis and identification of bilinear systems via block-pulse functions arc discussed, and recursive algorithms convenient for computer are presented. Compared with walsh function approaches, the results are much simpler in form. In this method, any positive integer could be chosen as the number of sub-intervals. Consequently, much computing time and storage could be saved and round off error reduced. The recursive algorithm developed also makes it possible to identify the -parameters of bilinear systems on-line.