This study Is the investigation on the forms of the windbreak forest and the effects of the protection against wind in OKINAWA folkhouses. We had measured the wind speed in the sites of typical folkhouses for above one year. The results are as follows. (1)The wind speed In the planetype village is less 90-80 % than that at seashore.(2)In the KUSATE type village, the wind speed is about 70-80% of that at Kume air-port, and sometimes, the strong wind blows from mountain.(3)The folkhouses of OKINAWA are destroyed by over 33m/s wind speed, it sometimes occurs over than 60m/s wlnd speed, but in the sites of folkhouse surrounded by FUKUGI-trees which are planted at intervals of one meter, the wind speed is decreased to less than 30m/s by the trees.
