Documentation for JIRA 5.2. Documentation for other versions of JIRA is available too. 
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プロジェクト リンクを削除すると、2 つのプロジェクトでの情報の共有が停止されます。
If you have set up multiple project links to the same application, for example you have linked a JIRA project to multiple Confluence spaces, deleting the primary link will mean that another of the links will be made the primary link.
To delete a project link:
Screenshot above: Confirming the deletion of a project link
Adding Project Links between Applications
Making a Project Link the Primary Link