Floating flexible barriers are used for preventing pollution caused by marine construction works accompanied by reclamation, dredging and so on. The barriers, however, are only utilized under construction as temporally-used structures and they are usually removed after the completion of such construction works. Therefore their strength against exerting forces has not been necessarily examined for their designing.
　In the present paper hydrodynamic characteristics of the barriers have been studied. Experimental results on the behavior and exerting force of barriers in a flow field were analyzed. Numerical model has also been suggested, based on drag coefficients obtained by experiments, for the prediction of their deformation.