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In recent years, collaborative editing system that is an important application of Computer Supported Cooperative Work field has made a lot of progress. But most of the collaborative editing systems have the disadvantages about maintenance and huge investment etc. In order to solve these problems, this paper proposes a collaborative editing system based on SaaS(Software as a Service). The realization of the system includes the following aspects: (1) Introducing and analyzing SaaS cloud computing model; (2) Designing the message model and communication model of collaborative editing system; (3) Setting up the SaaS development environment; (4) Designing and realizing a collaborative editing system based on the SaaS model. The collaborative editing system based on SaaS can not only support the cross-platform operation, but also reduce development cost and it's convenient for the system maintenance and upgrade.