Abstract: With the development of computer network and virtualization technology,the desktop virtualization solution is becoming more and more mature.Desktop virtualization technology changes the past decentralized and independent service mode and provides users a kind of unified and secure desktop service.The SPICE(Simple Protocol for Independent Computing Environment) can provide the dynamic adaptive virtual desktop service with high performance as an open source virtual desktop solution.Based on virtualization technology and SPICE protocol,this article built a desktop virtualization platform to provide users with desktop virtualization services,named the transparent desktop services.However,there are still many deficiencies in this solution.For instance,it cannot be applied to the environment of high user controllability,and the quality of graphic interactive experience is to be improved.Therefore,SPICE was optimized in this paper.A transparent file transfer mechanism was proposed,which achieves file transfer between Guest OS and client.And the performance of SPICE graphical interaction was improved,which reduces response time of users’ operations.Finally,experiment results show that the optimizations can provide users with higher user-controllable service and better experience quality.

Key words: Desktop virtualization,SPICE,Transparent desktop service,File transfer,Graphical optimization