Okinawa language which was once widely used in Royal period is now endangered because the Japanese government practices the policy of pushing royalized education and forbidding the use of Okinawa language and punishing the use of dialect,generalizing the standard Japanese language as well as the influence of the American army dissimilating governing policy.

An Analysis of Ryukyu Islands Occupied by Japan in Modern Times and Its Damage to China Today;

The study about the relations among China, Japan and RyuKyu during the Ming Dynasty;

Characteristics of Growth and Soil Properties in a Mixed Stand of Pinus luchuensis and Schima wallichii kort. ssp. liukiuensis Bloenb. in Subtropical Zone;

Effects of site condition on litterfall and related nutrient return in Pinus luchuensis plantations;

Community Characteristics of Pinus luchuensis Forests after Typhoon Disturbance in Okinawa Island, Japan;

Geochemical Characteristics of Surficial Sediment Elements From the Sea Area East of the Ryukyu Islands;

Kuroshio in the East China Sea(KECS)and the currents in the east of the Ryukyu Islands are investigated by analyzing the up-to-date reanalysisdataof the high resolution ocean model.

Sediments distributed over the area east of Ryukyu Islands are enriched in volcaniclastic minerals,hornblende and Fe-Mn micro-nodules.

Analyses of sound velocity field in sea area by Ryūkyū-guntō;