In the case of port & harbour planning, the studies were not been enough progessed, from the view point of ship handling safety, to design or to layout the facilities such as water ways and break waters. Now a days, a ship maneuvering simulator that has high accuracy has developed and is available to apply for port planning.
　In this paper, some case studies of practical application of ship hadling simulator for port & harbour planning were intorduced. And the experiments of elementary ship handling in a ideal port were also reported, Major results are as follows,
1)A ship maneuvering simulator is very useful to estimate or to evaluate a port & harbor planning.
2)The procedures for evaluation were cleared through carrrying out the case studies of ship handling simulations under actual weather conditions.
3)The width of ship trajectory meander, lee way and average rudder angles were obtained by elementary ship handling simulations.
4)When the conditions were severe, the ship motion were unstable. Therefor the number of experiments should be sufficiently big to obtain the characteristics of ship motions or to evaluate the port planning for ship navigating safety.