在百度里搜了一大把，但都没得到解决问题的结果。然后果断google了一把，不出意外的第一个搜索结果就是我要的。现贴结果原文，有空再翻译下。
You should not remove plug-ins from Eclipse. Plug-ins should be installed as features using the Update Manager. The same Update Manager can be used to disable plug-ins by disabling the feature they belong to. Run Help > About Eclipse > Installation
Details, select the software you no longer want and click Uninstall. (On Macintosh it is Eclipse > About Eclipse > Installation Details.) In older versions, you might need to Run Help > Software Updates >
Manage Configuration..., select the feature of interest, and disable it with the task shown in the right window.
When a feature is disabled, all its plug-ins will be disabled also. They are still available on disk, and they can be enabled at any time in the future.
To physically remove the feature and its plug-ins, you will have to manually remove the feature from the eclipse/features directory and its plug-ins from the eclipse/plugins directory. We advise extreme caution here. Remove the wrong ones,
and you may have quite some trouble restoring your Eclipse to a stable state. Unless you care a lot about hard disk use, we recommend leaving the plug-ins where they are.
Note that when manually removing plugins as described above, some metadata is still cached by Eclipse, which can lead to problems later on. Running Eclipse with the -clean option can help with that, as it causes Eclipse to clean the cached metadata.
See the Running
Eclipse help page for details about this option.
引用url：http://wiki.eclipse.org/FAQ_How_do_I_remove_a_plug-in%3F
unning Eclipse 所指向的url即eclipse中所有问题的FAQ： http://help.eclipse.org/kepler/index.jsp?topic=/org.eclipse.platform.doc.user/tasks/running_eclipse.htm