Embedded service is  widely used in many applications for its convenience. However, it is usually confined to specific application systems. In this paper, the authors present an Embedded Ubiquitous Personal Knowledge Service(EUPKS) model  which aims to breaking through the border of application systems,  conducting knowledge organizing and  constructing embedded services throughout personal knowledge activity workflows. We describe the principle, the formulation expression, the framework, the tech-architecture and key technologies. Finally, a prototype system is given based on the desktop search tool of National Science Library (NSL).