Environmental load plays a key role in the force and motion response of mooring system.It is necessary to research the key environmental parameters of the mooring system,and reveal the environment parameters on the effect and influence mechanism of the mooring system.Based on the potential flow theory,combined with the large water dynamics software AQWA,we take a simple rectangular pontoon structure as the typical example.Based on the floating body,related technical requirements and basic parameters,we establish mooring system dynamic analysis calculation model by the tension and catenary two different ways.The results show that within the scope of the discussion,mooring force increases with the increase of wind speed as the flow velocity and flow direction.For transverse oscillation and roll,with the increase of environmental parameters such as flow rate,wind speed,swaying and roll curve show increasing trend.The tension mooring type can maintain stability of the mooring system better.