This paper proposes a chemical abstract machine model to accurately describe the behavior characteristics of components. we analyze the chemical abstract machine from the software point of view and the give formal description of chemical abstract machine. the dynamic characteristics of components are also analyzed. the definition of chemical abstract machine and relevant rules are extented to make it more accurately describe the dynamic behavior of some components. finally, an actual case of component is described using the extended component chemical abstract machine model. the extended component chemical abstract machine model provides a good theoretical foundation for generating effective test cases in component testing.