<FONT face=Verdana>The existence and being able to find a large number of reusable components is one of the prerequisites of componentbased software reuse.Software component library is the infrastructure of component management.It can help developers find appropriate components.Component tag based taxonomy is a new method to manage components in component library.It uses component tag to manage component and supports users using tags to find components.This method is efficient in component ma<FONT face=Verdana>nagement because component tag represents the characteristics ofcomponents.However

many components don’t have component tags in component library.Adding tags for these components manually needs a lot of time and workload.It’s almost impossible when there are a lot of such components.So

this paper proposed an automatic component tag extracting method based on classification.This method extracts<FONT face=Verdana>component tags from component descriptions automatically.This paper described a<FONT face=Verdana>tool based on this method and verified the effectiveness of the tool.