Aiming at the lack of operation standards of waves for the handing operations of moored ships under longer period wave action,a systematic analysis and research has been carried out.In this paper,physical model tests on the hydrodynamic characteristics are conducted for a series of oil tankers,LNG vessels and bulk carriers considering a large wave period range.The variations of ship motion with wave period are analyzed,and combined with relevant regulations,the reduction coefficients for the wave height of ship operation under longer period waves action with period variation are proposed.The research results can provide scientific support for relevant research and design.