A　method　of　human　skin　region　detection　based　on　PCNN　is　proposed　in　this　paper.　Firstly,　the　input　origin　image　is　translated　from　RGB　color　space　to　YIQ　color　space,　and　I　channel　image　is　obtained.　Secondly,　we　use　the　synchronous　Pulse　firm,,　mechanism　of　pulse　coupled　neural　network　(PCNN)　to　stimulate　the　skill　region　detection　mechanism　of　human　eyes.　Skill　and　non-skin　regions　are　fired　in　different　time.　Therefore.　skin　regions　are　detected.　Our　comparison　with　other　methods　shows　that　the　proposed　method　produces　more　accurate　segmentation　results.