| With the change of computer industry, research and development of embedded system is becoming a popular field now. From initial singlechip structure to nowaday embedded structure with special operating system, embedded system is more and more complex. How to design the complex embedded system is an important task that needs to be discussed now.As the standard of object oriented modeling technique, UML is suitable for making complex system design simplify. And UML has its special advantage in the design of embedded system. However, the embedded system designed in UML exists many disadvantages in system reuse. Therefore,the thesis introduces component technique in design and development of embedded system.Component based software development is considered as one of the best methods to resolve system reuse. It is not only advantageous in system reuse, but also is advantageous to advance the productivity of software development, which shortens the development cycle of application software obviously, improves quality of software, and makes software maintance easier.The thesis first introduces some basic knowledge about UML modeling language and analyzes the disadvantages of UML in embedded system modeling. Then according to the needs of embedded system design,the thesis improves on the UML modeling technique--It introducescomponent technique to UML modeling, which is named as UML modeling technique based on component (emUML). And it advances effectively the reuse rate of embedded system modeled in UML.And the thesis also analyzes the whole process of how to model embedded system in emUML according to every phase of software engineering, discusses the key techniques of the modeling process.Finally, according to the result analyzed, the thesis designs aembedded browser in practice. And it also analyzes the important function modules of the embedded browser in detail, such as the design of network interface module, the design of word parse module and the design of layout and display module.
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