In the last few years there has been much interest in the studies of chaoticandcomplicated phenomena in systems. Numerous journals have been devoted to theanalysis of such phenomena in systems. This paper focuses on applications of the theoryof chaotic circuit to communication systems. There are some advantages found inchaotic communication systems: (a)transmitted signals have spread spectrum (b)goodauto-correlation and cross-correlation properties (c)generation of chaotic signal issimple. The major aim of this project is to investigate applications of chaotic signals togenerate a PN sequence of spread-spectrum communication system. Finally, computersimulations will be provided to illustrate our analysis.