It　introduces　a　new　method-Omnidirectional　M-mode　echocardiography,　which　can　detect　the　dynamic　information　from　sequential　echocardiography.　The　method　for　detecting　dynamic　information　is　based　on　the　rebuilding　of　their　gray　(position)-time　function　on　direction　lines.　So　the　system　can　get　motion　track,　motion　velocity　and　acceleration　of　a　part　of　a　cardiac　structure　at　moment.　The　system　also　can　show　a　lot　of　omnidirectional　M-mode　echocardiography　with　ECG　synchronously,　that　is　rebuild　from　2D　echocardiography.　The　ECG　can　supply　a　standard　of　time　for　omnidirectional　M-mode　echocardiography.