For water mooring system,mooring pattern has very important influence on the mooring force and motion precision of the mooring system,so it is necessary to analyze different mooring methods on mooring system movement performance and the influence of the mooring cable dynamic performance to reveal the effect and mechanism of mooring pattern on mooring system.Based on the potential flow theory,combined with the large water dynamics software AQWA,with a simple rectangular pontoon structures as the typical example,based on the basic tank parameters and related technical requirements,considering the main factors influencing the mooring performance such as mooring radius,the pretension and the opening angle,the dynamic analysis and calculation model of mooring system is established.The results show that the influence of mooring radius on maximum mooring force decreases with the increase of mooring radius.Increasing the pretension of mooring cable can effectively reduce the longitudinal drift of floating body and improve the stability of mooring system.Increasing the opening angle of mooring cable can better resist the lateral environment load and improve the platform positioning ability.