Facing　challenges　of　bandwidth　limitation,　high　real-time　and　high　computing,　we　propose　a　novel　design　of　mobile　digital　video　surveillance　system　(MDVS)　in　virtue　of　hardware-software　co-design　approach　and　TI　DaVinci　technology.　GPRS　is　adopted　as　communication　network　without　infrastructure　installation.　The　hardware　based　on　dual-core　DM6446　and　software　design　based　on　H.264　tackle　bandwidth　and　real-time　challenges　excellently.　With　other　peripherals,　the　design　implements　a　wide　range　of　MDVS　functionalities　such　as　motion　detection,　PTZ　control,　etc.　The　merits　of　low　cost,　low　bandwidth,　high　flexibility,　ease　installation,　convenient　operation　make　the　application　can　be　applied　in　a　variety　of　scenarios.