This paper gives the system design diagram, and made a detailed explanation to its structure and the basic principle. System consists of hardware and software design, hardware part mainly includes S3C2410, Flash, SDRAM memory interface, the software includes the compilation and transplantation of Mplayer, the QTE graphical use interface design and transplant. At the same time, this paper also studies the key technologies of the system software, including Bootloader design, kernel cutting and root file system design. Finally, the actual effect of the system is given, implement the thought of VOD, achieve the design purpose of the system. The system can make the students online learning at any time, relieve the teaching difficulties effectively, the system combine embedded technology and streaming media technology, it has the advantages of small volume, convenient operation, low cost and good stability.