A　design　of　hydropower　plant　communication　manager　based　on　WinCE　and　IEC60870-5-104　protocol　is　introduced.　The　WinCE　based　serial　programming　technique,　Ethernet　programming　technique　and　multi-thread　programming　technique　are　used　to　realize　the　communication　between　the　communication　manager,　MOXA　UC7410CE　embedded　industrial　computer,　with　different　devices　via　various　protocols,　such　as　DL/T645,　CDT,　Modbus,　etc..　IEC60870-5-104　protocol　is　used　to　communicate　with　the　monitoring　computer.　The　frame　structure　of　IEC60870-5-104　and　its　implementation　in　WinCE　system　are　analyzed,　and　the　flowcharts　of　sending　and　receiving　procedures　are　presented.　A　method　to　manage　multiple　TCP　client　connections　is　also　presented,　enabling　several　host　computers　connecting　to　the　communication　manager　and　sharing　data.　The　high　reliability　of　the　embedded　industrial　computer　guarantees　a　long-term　stable　operation.