Abstract: With the development of distributed computing technologies, browser-based Web operating system (WebOS) came into being. It provides mechanisms for integrating services and resources on the Internet. And it makes services and resources available for online users regardless of where they are and when it is. WebOS represents a trend towards future use of thin client based Web applications. It has become one of the most important patterns of utilization in the coming cloud computing era. We first introduced the concepts and structure of WebOS. Then we analyzed related work and the trends of WebOS. And we also discussed the technical factors which cumber the development of WebOS. Finally,we made comprehensive research on EycOS, which is a typical open source WebOS. We analyzed EycOS's structure and APIs. hhen we extended its functions by implement a SOAP-based hravel service.

Key words: Cloud computing, Thin client, WebOS, Web service