In　order　to　improve　the　detection　effect　of　omni-directional　M-mode　echocardiography　motion　curve,　this　paper　focuses　on　the　research　of　the　related　issues　and　proposes　an　edge　detection　algorithm　with　fuzzy　enhancement　and　gray　system　theory　for　the　omni-directional　M-mode　echocardiography＇s　motion　curve.　Firstly,　the　improved　fuzzy　enhancement　algorithm　is　used　to　enhance　the　edge　information,　while　suppressing　the　noise　and　background.　Moveover,　the　proposed　algorithm　is　used　to　detect　edges　on　echocardiography　image　based　on　a　ststistic　which　is　constructed　by　gray　correlation　in　gray　system　theory.　Finally,　the　best　motion　edges　can　be　obtained　by　eliminating　noise　and　connecting　crack　motion　curve.　Experimental　results　show　that　the　proposed　algorithm　has　better　accuracy　and　strong　robustness　against　the　noise.　©　2016,　Science　Press.　All　right　reserved.