The　memory　management　is　one　of　the　most　central　tasks　in　embedded　operating　system.　This　paper　introduces　one　useful　method　of　dynamic　memory　management　in　embedded　system　based　on　mu　C/OS-II.　Compared　with　mu　C/OS-II＇s　own　memory　management,　the　new　method　is　simpler,　more　stable　and　lower　costs.　As　demonstrated　on　searching　TV　programs　in　DTV　STB,　this　new　dynamic　memory　management　works　well　and　the　embedded　system　can　be　in　a　high　efficient　and　more　stable　operation.