Collisions at sea are perils for marine enterprises during their marine adventures. It is, in practice, for the interested parties to insure collision liability cover attached to the ship policies, and P & I insurance to transfer such risks. This work is then proposed to have a quest for the practical application and corresponding connection amongst those collision liability clauses in marine insurance policies. In order to cope with the court practice in Taiwan, purposely by the Author, not only the application in English law context, which generally governs those policies, but also the application under Taiwanese law is explored. At the same time, the Author utilizes the accompanied result originating from the research process of this work to propose to further amend part of the liability insurance provisions in the current Taiwanese Insurance Code.