Since 1973, a big project of constructin of a new beach has been developed along Suma Coast in Kobe City facing to Osaka Bay in Japan. At the many, steps of the project, the arrangement and the design of structures such as detouched breakwaters, groins, sea dike and so on have been checked by physical model from view points of the stability of beach, of the water pollution near the beach, and of the effect of strucutres for prevention of desasters. Following results of recent three experiments on the stability of beach in these investigations are reported in this paper, that is;
　1) On the effects of detouched breakwater and other structures added to the plan for the first stage of the project for the stability of new beach.
　2) On the effect of submerged breakwater for the stability of perched beaches planed in the second stage of the project.
　3) On the investigatin on the arrangement of structure in the second stage of the project from the standing point of beach stability.