Since it has been years of VoD researching, the challenge of VoD in current environment is going to be discussed in Chapter 1. For extending applications of VoD based on DSS(Darwin Streaming Server) platform, some effort is spent for understanding underlying schema of DSS in Chapter 3. During the digital age, Digital content , digital services are risen already, but a integrated system as a middle interface is still lack of for adapting and negotiating among servers and clients. Therefore the VoD server must be able to communicate with middleware to extend service provision, to increase value of VoD service. And also, fashion VCR request handling capability is discussed in this thesis.