By　means　of　the　diffusion　entropy　approach,　we　detect　the　scale-invariance　characteristics　embedded　in　the　4737　human　promoter　sequences.　The　exponent　for　the　scale-invariance　is　in　a　wide　range　of　[0.3,0.91,　which　centered　at　J,　=　0.66.　The　distribution　of　the　exponent　can　be　separated　into　left　and　right　branches　with　respect　to　the　maximum.　The　left　and　right　branches　are　asymmetric　and　can　be　fitted　exactly　with　Gaussian　form　with　different　widths,　respectively.　(c)　2007　Elsevier　Ltd.　All　rights　reserved.