Taking a port in Africa as an example,we conduct the sensitivity analysis on the main influencing factors such as wind,waves,and currents that affect ship operations,identify the characteristics and patterns of each influencing factor,and determine the calculation quantity of typical working conditions.Then we use MIKE21MA software for mooring analysis,compare the calculation results with control standards,and calculate the non-operational time by combining them with the joint frequency distribution of wave height and period.The results show that considering mooring conditions alone,the completely unstable mooring time accounts for 9.41% (37 days),instantaneous unstable mooring time accounts for 41.4% (148 days),and the completely stable mooring time accounts for 49.19% (approximately 180days).The method for determining the non-operational time in this project can be extended to similar terminal projects affected by long period waves.Sensitivity analysis can reduce calculation groups and improve calculation efficiency under limited resource conditions.